diff --git a/Cargo.toml b/Cargo.toml
index d62168e..79d3d6b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,10 @@ edition = "2018"
 activitystreams = { version = "0.6.1", default-features = false, features = ["kinds","primitives"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+typed-builder = "0.5.1"
 
 [dev-dependencies]
 anyhow = "1.0"
+
+[patch.crates-io]
+typed-builder = { git = "https://git.asonix.dog/asonix/typed-builder" }
diff --git a/examples/basic.rs b/examples/basic.rs
index 3d28669..c7e3d5a 100644
--- a/examples/basic.rs
+++ b/examples/basic.rs
@@ -5,22 +5,16 @@ use activitystreams_new::{
 };
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let mut v: ApObject<Video> = Default::default();
+    let video = Video::builder()
+        .context(context())
+        .id("https://example.com/@example/lions".parse::<XsdAnyUri>()?)
+        .url("https://example.com/@example/lions/video.webm".parse::<XsdAnyUri>()?)
+        .summary(XsdString::from("A cool video"))
+        .media_type("video/webm".parse()?)
+        .duration("PT4M20S".parse()?)
+        .build();
 
-    v.inner.context = Some(context().into());
-    v.inner.id = Some(
-        "https://example.com/@example/lions"
-            .parse::<XsdAnyUri>()?
-            .into(),
-    );
-    v.inner.url = Some(
-        "https://example.com/@example/lions/video.webm"
-            .parse::<XsdAnyUri>()?
-            .into(),
-    );
-    v.inner.summary = Some(XsdString::from("A cool video").into());
-    v.inner.media_type = Some("video/webm".parse()?);
-    v.inner.duration = Some("PT4M20S".parse()?);
+    let v = ApObject::builder().inner(video).build();
 
     println!("Video, {:#?}", v);
 
diff --git a/src/activity.rs b/src/activity.rs
index 395bb7f..ad3685a 100644
--- a/src/activity.rs
+++ b/src/activity.rs
@@ -4,6 +4,7 @@ use crate::{
     traits::{self, Extends, WithUnparsed, WithUnparsedExt},
 };
 use std::convert::TryFrom;
+use typed_builder::TypedBuilder;
 
 pub mod kind {
     pub use activitystreams::activity::kind::*;
@@ -37,119 +38,159 @@ pub type Offer = ActorAndObjectOptTarget<OfferType>;
 pub type Move = ActorAndObjectOptOriginAndTarget<MoveType>;
 pub type Remove = ActorAndObjectOptOriginAndTarget<RemoveType>;
 
-pub trait NormalActivity {
+pub trait NormalActivity: traits::Activity {
     fn actor(&self) -> &OneOrMany<AnyObject>;
     fn object(&self) -> &OneOrMany<AnyObject>;
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Activity<Kind> {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub result: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub instrument: Option<Option<AnyObject>>,
+    #[builder(default, setter(strip_option, into))]
+    pub instrument: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Object<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct ActorAndObject<Kind> {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub object: OneOrMany<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Activity<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Arrive {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub origin: OneOrMany<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Activity<ArriveType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Invite {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub object: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub target: OneOrMany<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Activity<InviteType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Delete {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub object: OneOrMany<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub origin: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Activity<DeleteType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct ActorAndObjectOptOriginAndTarget<Kind> {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub object: OneOrMany<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub origin: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub target: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Activity<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct ActorAndObjectOptTarget<Kind> {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
+
+    #[builder(setter(into))]
     pub object: OneOrMany<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub target: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Activity<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Travel {
+    #[builder(setter(into))]
     pub actor: OneOrMany<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub origin: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub target: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Activity<TravelType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Question {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub one_of: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub any_of: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
@@ -492,6 +533,14 @@ impl<Kind> TryFrom<Object<Kind>> for Activity<Kind> {
     }
 }
 
+impl<Kind> TryFrom<Activity<Kind>> for Object<Kind> {
+    type Error = serde_json::Error;
+
+    fn try_from(activity: Activity<Kind>) -> Result<Self, Self::Error> {
+        activity.retracting()
+    }
+}
+
 impl<Kind> Extends<Object<Kind>> for ActorAndObject<Kind> {
     type Error = serde_json::Error;
 
@@ -512,6 +561,14 @@ impl<Kind> TryFrom<Object<Kind>> for ActorAndObject<Kind> {
     }
 }
 
+impl<Kind> TryFrom<ActorAndObject<Kind>> for Object<Kind> {
+    type Error = serde_json::Error;
+
+    fn try_from(activity: ActorAndObject<Kind>) -> Result<Self, Self::Error> {
+        activity.retracting()
+    }
+}
+
 impl Extends<Object<ArriveType>> for Arrive {
     type Error = serde_json::Error;
 
@@ -532,6 +589,14 @@ impl TryFrom<Object<ArriveType>> for Arrive {
     }
 }
 
+impl TryFrom<Arrive> for Object<ArriveType> {
+    type Error = serde_json::Error;
+
+    fn try_from(arrive: Arrive) -> Result<Self, Self::Error> {
+        arrive.retracting()
+    }
+}
+
 impl Extends<Object<InviteType>> for Invite {
     type Error = serde_json::Error;
 
@@ -552,6 +617,14 @@ impl TryFrom<Object<InviteType>> for Invite {
     }
 }
 
+impl TryFrom<Invite> for Object<InviteType> {
+    type Error = serde_json::Error;
+
+    fn try_from(invite: Invite) -> Result<Self, Self::Error> {
+        invite.retracting()
+    }
+}
+
 impl Extends<Object<DeleteType>> for Delete {
     type Error = serde_json::Error;
 
@@ -572,6 +645,14 @@ impl TryFrom<Object<DeleteType>> for Delete {
     }
 }
 
+impl TryFrom<Delete> for Object<DeleteType> {
+    type Error = serde_json::Error;
+
+    fn try_from(delete: Delete) -> Result<Self, Self::Error> {
+        delete.retracting()
+    }
+}
+
 impl<Kind> Extends<Object<Kind>> for ActorAndObjectOptOriginAndTarget<Kind> {
     type Error = serde_json::Error;
 
@@ -592,6 +673,14 @@ impl<Kind> TryFrom<Object<Kind>> for ActorAndObjectOptOriginAndTarget<Kind> {
     }
 }
 
+impl<Kind> TryFrom<ActorAndObjectOptOriginAndTarget<Kind>> for Object<Kind> {
+    type Error = serde_json::Error;
+
+    fn try_from(activity: ActorAndObjectOptOriginAndTarget<Kind>) -> Result<Self, Self::Error> {
+        activity.retracting()
+    }
+}
+
 impl<Kind> Extends<Object<Kind>> for ActorAndObjectOptTarget<Kind> {
     type Error = serde_json::Error;
 
@@ -612,6 +701,14 @@ impl<Kind> TryFrom<Object<Kind>> for ActorAndObjectOptTarget<Kind> {
     }
 }
 
+impl<Kind> TryFrom<ActorAndObjectOptTarget<Kind>> for Object<Kind> {
+    type Error = serde_json::Error;
+
+    fn try_from(activity: ActorAndObjectOptTarget<Kind>) -> Result<Self, Self::Error> {
+        activity.retracting()
+    }
+}
+
 impl Extends<Object<TravelType>> for Travel {
     type Error = serde_json::Error;
 
@@ -632,6 +729,14 @@ impl TryFrom<Object<TravelType>> for Travel {
     }
 }
 
+impl TryFrom<Travel> for Object<TravelType> {
+    type Error = serde_json::Error;
+
+    fn try_from(travel: Travel) -> Result<Self, Self::Error> {
+        travel.retracting()
+    }
+}
+
 impl Extends<Object<QuestionType>> for Question {
     type Error = serde_json::Error;
 
@@ -652,6 +757,14 @@ impl TryFrom<Object<QuestionType>> for Question {
     }
 }
 
+impl TryFrom<Question> for Object<QuestionType> {
+    type Error = serde_json::Error;
+
+    fn try_from(question: Question) -> Result<Self, Self::Error> {
+        question.retracting()
+    }
+}
+
 impl<Kind> WithUnparsed for Activity<Kind> {
     fn unparsed(&self) -> &Unparsed {
         self.inner.unparsed()
@@ -742,7 +855,10 @@ impl WithUnparsed for Question {
     }
 }
 
-impl<Kind> NormalActivity for ActorAndObject<Kind> {
+impl<Kind> NormalActivity for ActorAndObject<Kind>
+where
+    Kind: std::fmt::Debug,
+{
     fn actor(&self) -> &OneOrMany<AnyObject> {
         &self.actor
     }
@@ -752,7 +868,10 @@ impl<Kind> NormalActivity for ActorAndObject<Kind> {
     }
 }
 
-impl<Kind> NormalActivity for ActorAndObjectOptTarget<Kind> {
+impl<Kind> NormalActivity for ActorAndObjectOptTarget<Kind>
+where
+    Kind: std::fmt::Debug,
+{
     fn actor(&self) -> &OneOrMany<AnyObject> {
         &self.actor
     }
@@ -762,7 +881,10 @@ impl<Kind> NormalActivity for ActorAndObjectOptTarget<Kind> {
     }
 }
 
-impl<Kind> NormalActivity for ActorAndObjectOptOriginAndTarget<Kind> {
+impl<Kind> NormalActivity for ActorAndObjectOptOriginAndTarget<Kind>
+where
+    Kind: std::fmt::Debug,
+{
     fn actor(&self) -> &OneOrMany<AnyObject> {
         &self.actor
     }
diff --git a/src/actor.rs b/src/actor.rs
index 84a9a2a..1db92d9 100644
--- a/src/actor.rs
+++ b/src/actor.rs
@@ -3,6 +3,7 @@ use crate::{
     primitives::{OneOrMany, Unparsed, XsdAnyUri, XsdString},
     traits::{self, Extends, WithUnparsed, WithUnparsedExt},
 };
+use typed_builder::TypedBuilder;
 
 pub mod kind {
     pub use activitystreams::actor::kind::*;
@@ -16,53 +17,66 @@ pub type Organization = Object<OrganizationType>;
 pub type Person = Object<PersonType>;
 pub type Service = Object<ServiceType>;
 
-#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct ApActor<Inner> {
     pub inbox: XsdAnyUri,
     pub outbox: XsdAnyUri,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub following: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub followers: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub liked: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub streams: Option<OneOrMany<XsdAnyUri>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub preferred_username: Option<XsdString>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub endpoints: Option<Endpoints>,
 
     #[serde(flatten)]
     pub inner: Inner,
 }
 
-#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
 pub struct Endpoints {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub proxy_url: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub oauth_authorization_endpoint: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub oauth_token_endpoint: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub provide_client_key: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub sign_client_key: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub shared_inbox: Option<XsdAnyUri>,
 }
 
diff --git a/src/collection.rs b/src/collection.rs
index 5318ca1..0430ad6 100644
--- a/src/collection.rs
+++ b/src/collection.rs
@@ -1,76 +1,74 @@
 use crate::{
     object::{AnyObject, Object},
-    primitives::{OneOrMany, Unparsed},
+    primitives::{OneOrMany, Unparsed, XsdNonNegativeInteger},
     traits::{self, Extends, WithUnparsed, WithUnparsedExt},
 };
-use activitystreams::primitives::XsdNonNegativeInteger;
 use std::convert::TryFrom;
+use typed_builder::TypedBuilder;
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub enum OrderedCollectionType {
-    OrderedCollection,
+pub mod kind {
+    pub use activitystreams::collection::kind::*;
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub enum UnorderedCollectionType {
-    UnorderedCollection,
-}
-
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub enum OrderedCollectionPageType {
-    OrderedCollectionPage,
-}
-
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub enum UnorderedCollectionPageType {
-    UnorderedCollectionPage,
-}
+use self::kind::*;
 
 pub type OrderedCollection = Collection<OrderedCollectionType>;
-pub type UnorderedCollection = Collection<UnorderedCollectionType>;
-pub type UnorderedCollectionPage = CollectionPage<UnorderedCollectionPageType>;
+pub type UnorderedCollection = Collection<CollectionType>;
+pub type UnorderedCollectionPage = CollectionPage<CollectionPageType>;
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Collection<Kind> {
+    #[builder(setter(into))]
     pub items: OneOrMany<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub total_items: Option<i64>,
+    #[builder(default, setter(strip_option, into))]
+    pub total_items: Option<XsdNonNegativeInteger>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub current: Option<Object<serde_json::Value>>,
+    #[builder(default, setter(strip_option, into))]
+    pub current: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub first: Option<Object<serde_json::Value>>,
+    #[builder(default, setter(strip_option, into))]
+    pub first: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub last: Option<Object<serde_json::Value>>,
+    #[builder(default, setter(strip_option, into))]
+    pub last: Option<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Object<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct CollectionPage<Kind> {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub part_of: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub next: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub prev: Option<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Collection<Kind>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct OrderedCollectionPage {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub start_index: Option<XsdNonNegativeInteger>,
 
     #[serde(flatten)]
@@ -184,26 +182,34 @@ impl traits::Object for OrderedCollectionPage {}
 impl traits::Collection for OrderedCollectionPage {}
 impl traits::CollectionPage for OrderedCollectionPage {}
 
-impl Extends<Object<UnorderedCollectionType>> for UnorderedCollection {
+impl Extends<Object<CollectionType>> for UnorderedCollection {
     type Error = serde_json::Error;
 
-    fn extends(object: Object<UnorderedCollectionType>) -> Result<Self, Self::Error> {
+    fn extends(object: Object<CollectionType>) -> Result<Self, Self::Error> {
         Self::extending(object)
     }
 
-    fn retracts(self) -> Result<Object<UnorderedCollectionType>, Self::Error> {
+    fn retracts(self) -> Result<Object<CollectionType>, Self::Error> {
         self.retracting()
     }
 }
 
-impl TryFrom<Object<UnorderedCollectionType>> for UnorderedCollection {
+impl TryFrom<Object<CollectionType>> for UnorderedCollection {
     type Error = serde_json::Error;
 
-    fn try_from(object: Object<UnorderedCollectionType>) -> Result<Self, Self::Error> {
+    fn try_from(object: Object<CollectionType>) -> Result<Self, Self::Error> {
         Self::extending(object)
     }
 }
 
+impl TryFrom<UnorderedCollection> for Object<CollectionType> {
+    type Error = serde_json::Error;
+
+    fn try_from(collection: UnorderedCollection) -> Result<Self, Self::Error> {
+        collection.retracting()
+    }
+}
+
 impl Extends<Object<OrderedCollectionType>> for OrderedCollection {
     type Error = serde_json::Error;
 
@@ -224,26 +230,42 @@ impl TryFrom<Object<OrderedCollectionType>> for OrderedCollection {
     }
 }
 
-impl Extends<Object<UnorderedCollectionPageType>> for UnorderedCollectionPage {
+impl TryFrom<OrderedCollection> for Object<OrderedCollectionType> {
     type Error = serde_json::Error;
 
-    fn extends(object: Object<UnorderedCollectionPageType>) -> Result<Self, Self::Error> {
+    fn try_from(collection: OrderedCollection) -> Result<Self, Self::Error> {
+        collection.retracting()
+    }
+}
+
+impl Extends<Object<CollectionPageType>> for UnorderedCollectionPage {
+    type Error = serde_json::Error;
+
+    fn extends(object: Object<CollectionPageType>) -> Result<Self, Self::Error> {
         Self::extending(object)
     }
 
-    fn retracts(self) -> Result<Object<UnorderedCollectionPageType>, Self::Error> {
+    fn retracts(self) -> Result<Object<CollectionPageType>, Self::Error> {
         self.retracting()
     }
 }
 
-impl TryFrom<Object<UnorderedCollectionPageType>> for UnorderedCollectionPage {
+impl TryFrom<Object<CollectionPageType>> for UnorderedCollectionPage {
     type Error = serde_json::Error;
 
-    fn try_from(object: Object<UnorderedCollectionPageType>) -> Result<Self, Self::Error> {
+    fn try_from(object: Object<CollectionPageType>) -> Result<Self, Self::Error> {
         Self::extending(object)
     }
 }
 
+impl TryFrom<UnorderedCollectionPage> for Object<CollectionPageType> {
+    type Error = serde_json::Error;
+
+    fn try_from(collection_page: UnorderedCollectionPage) -> Result<Self, Self::Error> {
+        collection_page.retracting()
+    }
+}
+
 impl Extends<Object<OrderedCollectionPageType>> for OrderedCollectionPage {
     type Error = serde_json::Error;
 
@@ -264,6 +286,14 @@ impl TryFrom<Object<OrderedCollectionPageType>> for OrderedCollectionPage {
     }
 }
 
+impl TryFrom<OrderedCollectionPage> for Object<OrderedCollectionPageType> {
+    type Error = serde_json::Error;
+
+    fn try_from(collection_page: OrderedCollectionPage) -> Result<Self, Self::Error> {
+        collection_page.retracting()
+    }
+}
+
 impl<Kind> WithUnparsed for Collection<Kind> {
     fn unparsed(&self) -> &Unparsed {
         self.inner.unparsed()
diff --git a/src/object.rs b/src/object.rs
index 3e6c018..25cef97 100644
--- a/src/object.rs
+++ b/src/object.rs
@@ -2,11 +2,12 @@ use crate::{
     either::Either,
     primitives::{
         AnyString, MimeMediaType, OneOrMany, Unit, Unparsed, XsdAnyUri, XsdDateTime, XsdDuration,
-        XsdString,
+        XsdFloat, XsdString,
     },
     traits::{self, Extends, WithUnparsed, WithUnparsedExt},
 };
 use std::convert::TryFrom;
+use typed_builder::TypedBuilder;
 
 pub mod kind {
     pub use activitystreams::object::kind::*;
@@ -31,165 +32,214 @@ struct IdOrObject(Either<XsdAnyUri, Box<Object<serde_json::Value>>>);
 #[serde(transparent)]
 pub struct AnyObject(Either<IdOrObject, XsdString>);
 
-#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct Object<Kind> {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub context: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub id: Option<AnyObject>,
 
     #[serde(rename = "type")]
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub kind: Option<Kind>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub attachment: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub attributed_to: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub audience: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub content: Option<OneOrMany<AnyString>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub name: Option<OneOrMany<AnyString>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub summary: Option<OneOrMany<AnyString>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub url: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub media_type: Option<MimeMediaType>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub generator: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub image: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub location: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub preview: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub start_time: Option<XsdDateTime>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub end_time: Option<XsdDateTime>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub duration: Option<XsdDuration>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub published: Option<XsdDateTime>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub updated: Option<XsdDateTime>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub in_reply_to: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub replies: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub to: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub bto: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub cc: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub bcc: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
+    #[builder(default)]
     pub unparsed: Unparsed,
 }
 
-#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize, TypedBuilder)]
 #[serde(rename_all = "camelCase")]
+#[builder(doc)]
 pub struct ApObject<Inner> {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub shares: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub likes: Option<XsdAnyUri>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub source: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub upload_media: Option<OneOrMany<XsdAnyUri>>,
 
     #[serde(flatten)]
     pub inner: Inner,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
+#[builder(doc)]
 pub struct Place {
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub accuracy: Option<f64>,
+    #[builder(default, setter(strip_option, into))]
+    pub accuracy: Option<XsdFloat>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub altitude: Option<f64>,
+    #[builder(default, setter(strip_option, into))]
+    pub altitude: Option<XsdFloat>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub latitude: Option<f64>,
+    #[builder(default, setter(strip_option, into))]
+    pub latitude: Option<XsdFloat>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub longitude: Option<f64>,
+    #[builder(default, setter(strip_option, into))]
+    pub longitude: Option<XsdFloat>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub radius: Option<f64>,
+    #[builder(default, setter(strip_option, into))]
+    pub radius: Option<XsdFloat>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option))]
     pub units: Option<Unit>,
 
     #[serde(flatten)]
     pub inner: Object<PlaceType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
+#[builder(doc)]
 pub struct Profile {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub describes: Option<AnyObject>,
 
     #[serde(flatten)]
     pub inner: Object<ProfileType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
+#[builder(doc)]
 pub struct Relationship {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub subject: Option<AnyObject>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub object: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub relationship: Option<OneOrMany<AnyObject>>,
 
     #[serde(flatten)]
     pub inner: Object<RelationshipType>,
 }
 
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize, TypedBuilder)]
+#[builder(doc)]
 pub struct Tombstone {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub former_type: Option<OneOrMany<AnyObject>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default, setter(strip_option, into))]
     pub deleted: Option<XsdDateTime>,
 
     #[serde(flatten)]
@@ -347,6 +397,105 @@ impl Object<serde_json::Value> {
 }
 
 impl<Kind> Object<Kind> {
+    fn extending(mut unparsed: Unparsed) -> Result<Self, serde_json::Error>
+    where
+        Kind: serde::de::DeserializeOwned,
+    {
+        Ok(Object {
+            kind: WithUnparsedExt::remove(&mut unparsed, "type")?,
+            context: WithUnparsedExt::remove(&mut unparsed, "context")?,
+            id: WithUnparsedExt::remove(&mut unparsed, "id")?,
+            attachment: WithUnparsedExt::remove(&mut unparsed, "attachment")?,
+            attributed_to: WithUnparsedExt::remove(&mut unparsed, "attributedTo")?,
+            audience: WithUnparsedExt::remove(&mut unparsed, "audience")?,
+            content: WithUnparsedExt::remove(&mut unparsed, "content")?,
+            name: WithUnparsedExt::remove(&mut unparsed, "name")?,
+            summary: WithUnparsedExt::remove(&mut unparsed, "summary")?,
+            url: WithUnparsedExt::remove(&mut unparsed, "url")?,
+            media_type: WithUnparsedExt::remove(&mut unparsed, "mediaType")?,
+            generator: WithUnparsedExt::remove(&mut unparsed, "generator")?,
+            image: WithUnparsedExt::remove(&mut unparsed, "image")?,
+            location: WithUnparsedExt::remove(&mut unparsed, "location")?,
+            preview: WithUnparsedExt::remove(&mut unparsed, "preview")?,
+            start_time: WithUnparsedExt::remove(&mut unparsed, "startTime")?,
+            end_time: WithUnparsedExt::remove(&mut unparsed, "endTime")?,
+            duration: WithUnparsedExt::remove(&mut unparsed, "duration")?,
+            published: WithUnparsedExt::remove(&mut unparsed, "published")?,
+            updated: WithUnparsedExt::remove(&mut unparsed, "updated")?,
+            in_reply_to: WithUnparsedExt::remove(&mut unparsed, "inReplyTo")?,
+            replies: WithUnparsedExt::remove(&mut unparsed, "replies")?,
+            to: WithUnparsedExt::remove(&mut unparsed, "to")?,
+            bto: WithUnparsedExt::remove(&mut unparsed, "bto")?,
+            cc: WithUnparsedExt::remove(&mut unparsed, "cc")?,
+            bcc: WithUnparsedExt::remove(&mut unparsed, "bcc")?,
+            unparsed,
+        })
+    }
+
+    fn retracting(self) -> Result<Unparsed, serde_json::Error>
+    where
+        Kind: serde::ser::Serialize,
+    {
+        let Object {
+            kind,
+            context,
+            id,
+            attachment,
+            attributed_to,
+            audience,
+            content,
+            name,
+            summary,
+            url,
+            media_type,
+            generator,
+            image,
+            location,
+            preview,
+            start_time,
+            end_time,
+            duration,
+            published,
+            updated,
+            in_reply_to,
+            replies,
+            to,
+            bto,
+            cc,
+            bcc,
+            mut unparsed,
+        } = self;
+
+        WithUnparsedExt::insert(&mut unparsed, "type", kind)?;
+        WithUnparsedExt::insert(&mut unparsed, "context", context)?;
+        WithUnparsedExt::insert(&mut unparsed, "id", id)?;
+        WithUnparsedExt::insert(&mut unparsed, "attachment", attachment)?;
+        WithUnparsedExt::insert(&mut unparsed, "attributedTo", attributed_to)?;
+        WithUnparsedExt::insert(&mut unparsed, "audience", audience)?;
+        WithUnparsedExt::insert(&mut unparsed, "content", content)?;
+        WithUnparsedExt::insert(&mut unparsed, "name", name)?;
+        WithUnparsedExt::insert(&mut unparsed, "summary", summary)?;
+        WithUnparsedExt::insert(&mut unparsed, "url", url)?;
+        WithUnparsedExt::insert(&mut unparsed, "mediaType", media_type)?;
+        WithUnparsedExt::insert(&mut unparsed, "generator", generator)?;
+        WithUnparsedExt::insert(&mut unparsed, "image", image)?;
+        WithUnparsedExt::insert(&mut unparsed, "location", location)?;
+        WithUnparsedExt::insert(&mut unparsed, "preview", preview)?;
+        WithUnparsedExt::insert(&mut unparsed, "startTime", start_time)?;
+        WithUnparsedExt::insert(&mut unparsed, "endTime", end_time)?;
+        WithUnparsedExt::insert(&mut unparsed, "duration", duration)?;
+        WithUnparsedExt::insert(&mut unparsed, "published", published)?;
+        WithUnparsedExt::insert(&mut unparsed, "updated", updated)?;
+        WithUnparsedExt::insert(&mut unparsed, "inReplyTo", in_reply_to)?;
+        WithUnparsedExt::insert(&mut unparsed, "replies", replies)?;
+        WithUnparsedExt::insert(&mut unparsed, "to", to)?;
+        WithUnparsedExt::insert(&mut unparsed, "bto", bto)?;
+        WithUnparsedExt::insert(&mut unparsed, "cc", cc)?;
+        WithUnparsedExt::insert(&mut unparsed, "bcc", bcc)?;
+
+        Ok(unparsed)
+    }
+
     pub fn into_generic(self) -> Result<Object<serde_json::Value>, serde_json::Error>
     where
         Kind: serde::ser::Serialize,
@@ -611,6 +760,43 @@ impl traits::Object for Relationship {}
 impl traits::Base for Tombstone {}
 impl traits::Object for Tombstone {}
 
+impl<Kind> Extends<Unparsed> for Object<Kind>
+where
+    Kind: serde::de::DeserializeOwned + serde::ser::Serialize,
+{
+    type Error = serde_json::Error;
+
+    fn extends(unparsed: Unparsed) -> Result<Self, Self::Error> {
+        Self::extending(unparsed)
+    }
+
+    fn retracts(self) -> Result<Unparsed, Self::Error> {
+        self.retracting()
+    }
+}
+
+impl<Kind> TryFrom<Unparsed> for Object<Kind>
+where
+    Kind: serde::de::DeserializeOwned,
+{
+    type Error = serde_json::Error;
+
+    fn try_from(unparsed: Unparsed) -> Result<Self, Self::Error> {
+        Self::extending(unparsed)
+    }
+}
+
+impl<Kind> TryFrom<Object<Kind>> for Unparsed
+where
+    Kind: serde::ser::Serialize,
+{
+    type Error = serde_json::Error;
+
+    fn try_from(object: Object<Kind>) -> Result<Self, Self::Error> {
+        object.retracting()
+    }
+}
+
 impl<Inner> Extends<Inner> for ApObject<Inner>
 where
     Inner: WithUnparsed + traits::Object,
@@ -646,6 +832,14 @@ impl TryFrom<Object<PlaceType>> for Place {
     }
 }
 
+impl TryFrom<Place> for Object<PlaceType> {
+    type Error = serde_json::Error;
+
+    fn try_from(place: Place) -> Result<Self, Self::Error> {
+        place.retracting()
+    }
+}
+
 impl Extends<Object<ProfileType>> for Profile {
     type Error = serde_json::Error;
 
@@ -666,6 +860,14 @@ impl TryFrom<Object<ProfileType>> for Profile {
     }
 }
 
+impl TryFrom<Profile> for Object<ProfileType> {
+    type Error = serde_json::Error;
+
+    fn try_from(profile: Profile) -> Result<Self, Self::Error> {
+        profile.retracting()
+    }
+}
+
 impl Extends<Object<RelationshipType>> for Relationship {
     type Error = serde_json::Error;
 
@@ -686,6 +888,14 @@ impl TryFrom<Object<RelationshipType>> for Relationship {
     }
 }
 
+impl TryFrom<Relationship> for Object<RelationshipType> {
+    type Error = serde_json::Error;
+
+    fn try_from(relationship: Relationship) -> Result<Self, Self::Error> {
+        relationship.retracting()
+    }
+}
+
 impl Extends<Object<TombstoneType>> for Tombstone {
     type Error = serde_json::Error;
 
@@ -706,6 +916,14 @@ impl TryFrom<Object<TombstoneType>> for Tombstone {
     }
 }
 
+impl TryFrom<Tombstone> for Object<TombstoneType> {
+    type Error = serde_json::Error;
+
+    fn try_from(tombstone: Tombstone) -> Result<Self, Self::Error> {
+        tombstone.retracting()
+    }
+}
+
 impl<Kind> WithUnparsed for Object<Kind> {
     fn unparsed(&self) -> &Unparsed {
         &self.unparsed
diff --git a/src/primitives.rs b/src/primitives.rs
index 0c83ccd..316cb1d 100644
--- a/src/primitives.rs
+++ b/src/primitives.rs
@@ -1,7 +1,7 @@
 use crate::either::Either;
 
 pub use activitystreams::primitives::{
-    Length, MimeMediaType, RdfLangString, XsdAnyUri, XsdDateTime, XsdDuration,
+    Length, MimeMediaType, RdfLangString, XsdAnyUri, XsdDateTime, XsdDuration, XsdFloat,
     XsdNonNegativeInteger, XsdString,
 };
 
@@ -185,6 +185,18 @@ impl<T> OneOrMany<T> {
     }
 }
 
+impl crate::traits::Base for Unparsed {}
+
+impl crate::traits::WithUnparsed for Unparsed {
+    fn unparsed(&self) -> &Unparsed {
+        self
+    }
+
+    fn unparsed_mut(&mut self) -> &mut Unparsed {
+        self
+    }
+}
+
 impl From<XsdString> for AnyString {
     fn from(s: XsdString) -> Self {
         AnyString::from_xsd_string(s)