Autogenerate default cast in`#[ty]` unless `cast` is specified

42 files changed, 58 insertions, 92 deletions

diff --git a/crates/typst-macros/src/lib.rs b/crates/typst-macros/src/lib.rs
index 8ca7bcac..a9185a9b 100644
--- a/crates/typst-macros/src/lib.rs
+++ b/crates/typst-macros/src/lib.rs
@@ -116,6 +116,8 @@ pub fn func(stream: BoundaryStream, item: BoundaryStream) -> BoundaryStream {
 /// You can customize some properties of the resulting type:
 /// - `scope`: Indicates that the type has an associated scope defined by the
 ///   `#[scope]` macro
+/// - `cast`: Indicates that the type has a custom `cast!` implementation.
+///   The macro will then not autogenerate one.
 /// - `name`: The type's normal name (e.g. `str`). Defaults to the Rust name in
 ///   kebab-case.
 /// - `title`: The type's title case name (e.g. `String`). Defaults to the
diff --git a/crates/typst-macros/src/ty.rs b/crates/typst-macros/src/ty.rs
index 23f818bd..943bd453 100644
--- a/crates/typst-macros/src/ty.rs
+++ b/crates/typst-macros/src/ty.rs
@@ -28,18 +28,18 @@ pub fn ty(stream: TokenStream, item: syn::Item) -> Result<TokenStream> {
 
 /// Holds all relevant parsed data about a type.
 struct Type {
+    meta: Meta,
     ident: Ident,
     name: String,
     long: String,
-    scope: bool,
     title: String,
     docs: String,
-    keywords: Vec<String>,
 }
 
 /// The `..` in `#[ty(..)]`.
 struct Meta {
     scope: bool,
+    cast: bool,
     name: Option<String>,
     title: Option<String>,
     keywords: Vec<String>,
@@ -49,6 +49,7 @@ impl Parse for Meta {
     fn parse(input: ParseStream) -> Result<Self> {
         Ok(Self {
             scope: parse_flag::<kw::scope>(input)?,
+            cast: parse_flag::<kw::cast>(input)?,
             name: parse_string::<kw::name>(input)?,
             title: parse_string::<kw::title>(input)?,
             keywords: parse_string_array::<kw::keywords>(input)?,
@@ -59,37 +60,35 @@ impl Parse for Meta {
 /// Parse details about the type from its definition.
 fn parse(meta: Meta, ident: Ident, attrs: &[Attribute]) -> Result<Type> {
     let docs = documentation(attrs);
-    let (name, title) = determine_name_and_title(meta.name, meta.title, &ident, None)?;
+    let (name, title) =
+        determine_name_and_title(meta.name.clone(), meta.title.clone(), &ident, None)?;
     let long = title.to_lowercase();
-    Ok(Type {
-        ident,
-        name,
-        long,
-        scope: meta.scope,
-        keywords: meta.keywords,
-        title,
-        docs,
-    })
+    Ok(Type { meta, ident, name, long, title, docs })
 }
 
 /// Produce the output of the macro.
 fn create(ty: &Type, item: Option<&syn::Item>) -> TokenStream {
-    let Type {
-        ident, name, long, title, docs, keywords, scope, ..
-    } = ty;
+    let Type { ident, name, long, title, docs, meta, .. } = ty;
+    let Meta { keywords, .. } = meta;
 
-    let constructor = if *scope {
+    let constructor = if meta.scope {
         quote! { <#ident as #foundations::NativeScope>::constructor() }
     } else {
         quote! { None }
     };
 
-    let scope = if *scope {
+    let scope = if meta.scope {
         quote! { <#ident as #foundations::NativeScope>::scope() }
     } else {
         quote! { #foundations::Scope::new() }
     };
 
+    let cast = (!meta.cast).then(|| {
+        quote! {
+            #foundations::cast! { type #ident, }
+        }
+    });
+
     let data = quote! {
         #foundations::NativeTypeData {
             name: #name,
@@ -104,6 +103,7 @@ fn create(ty: &Type, item: Option<&syn::Item>) -> TokenStream {
 
     quote! {
         #item
+        #cast
 
         impl #foundations::NativeType for #ident {
             const NAME: &'static str = #name;
diff --git a/crates/typst-macros/src/util.rs b/crates/typst-macros/src/util.rs
index 4f7cc5fb..89880db1 100644
--- a/crates/typst-macros/src/util.rs
+++ b/crates/typst-macros/src/util.rs
@@ -255,6 +255,7 @@ pub mod kw {
     syn::custom_keyword!(span);
     syn::custom_keyword!(title);
     syn::custom_keyword!(scope);
+    syn::custom_keyword!(cast);
     syn::custom_keyword!(constructor);
     syn::custom_keyword!(keywords);
     syn::custom_keyword!(parent);
diff --git a/crates/typst/src/foundations/args.rs b/crates/typst/src/foundations/args.rs
index 01cf6d7f..54811437 100644
--- a/crates/typst/src/foundations/args.rs
+++ b/crates/typst/src/foundations/args.rs
@@ -38,7 +38,7 @@ use crate::syntax::{Span, Spanned};
 /// #let dict = (fill: blue)
 /// #text(..dict)[Hello]
 /// ```
-#[ty(scope, name = "arguments")]
+#[ty(scope, cast, name = "arguments")]
 #[derive(Clone, Hash)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Args {
diff --git a/crates/typst/src/foundations/array.rs b/crates/typst/src/foundations/array.rs
index 86d4c2ac..6f7c6347 100644
--- a/crates/typst/src/foundations/array.rs
+++ b/crates/typst/src/foundations/array.rs
@@ -67,7 +67,7 @@ pub use crate::__array as array;
 /// #(("A", "B", "C")
 ///     .join(", ", last: " and "))
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Default, Clone, PartialEq, Hash, Serialize, Deserialize)]
 #[serde(transparent)]
 pub struct Array(EcoVec<Value>);
diff --git a/crates/typst/src/foundations/auto.rs b/crates/typst/src/foundations/auto.rs
index 5cb03f7f..fcd72999 100644
--- a/crates/typst/src/foundations/auto.rs
+++ b/crates/typst/src/foundations/auto.rs
@@ -15,7 +15,7 @@ use crate::foundations::{
 /// contextual behaviour. A good example is the [text direction]($text.dir)
 /// parameter. Setting it to `{auto}` lets Typst automatically determine the
 /// direction from the [text language]($text.lang).
-#[ty(name = "auto")]
+#[ty(cast, name = "auto")]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct AutoValue;
 
diff --git a/crates/typst/src/foundations/bool.rs b/crates/typst/src/foundations/bool.rs
index 4c85a741..e88c8c6f 100644
--- a/crates/typst/src/foundations/bool.rs
+++ b/crates/typst/src/foundations/bool.rs
@@ -13,7 +13,7 @@ use crate::foundations::{ty, Repr};
 /// #true \
 /// #(1 < 2)
 /// ```
-#[ty(title = "Boolean")]
+#[ty(cast, title = "Boolean")]
 type bool;
 
 impl Repr for bool {
diff --git a/crates/typst/src/foundations/bytes.rs b/crates/typst/src/foundations/bytes.rs
index 4e894241..b2fd0e3b 100644
--- a/crates/typst/src/foundations/bytes.rs
+++ b/crates/typst/src/foundations/bytes.rs
@@ -37,7 +37,7 @@ use crate::foundations::{cast, func, scope, ty, Array, Reflect, Repr, Str, Value
 /// #array(data.slice(0, 4)) \
 /// #str(data.slice(1, 4))
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Clone, Hash, Eq, PartialEq)]
 pub struct Bytes(Arc<Prehashed<Cow<'static, [u8]>>>);
 
diff --git a/crates/typst/src/foundations/content.rs b/crates/typst/src/foundations/content.rs
index 3d40c703..e498c8cb 100644
--- a/crates/typst/src/foundations/content.rs
+++ b/crates/typst/src/foundations/content.rs
@@ -65,7 +65,7 @@ use crate::util::fat;
 /// In the web app, you can hover over a content variable to see exactly which
 /// elements the content is composed of and what fields they have.
 /// Alternatively, you can inspect the output of the [`repr`]($repr) function.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Clone, Hash)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Content(Arc<dyn NativeElement>);
diff --git a/crates/typst/src/foundations/datetime.rs b/crates/typst/src/foundations/datetime.rs
index 78290c99..28a0d177 100644
--- a/crates/typst/src/foundations/datetime.rs
+++ b/crates/typst/src/foundations/datetime.rs
@@ -111,7 +111,7 @@ use crate::World;
 /// will be stored as a plain date internally, meaning that you cannot use
 /// components such as `hour` or `minute`, which would only work on datetimes
 /// that have a specified time.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Clone, Copy, PartialEq, Hash)]
 pub enum Datetime {
     /// Representation as a date.
diff --git a/crates/typst/src/foundations/dict.rs b/crates/typst/src/foundations/dict.rs
index b43c5428..f072a619 100644
--- a/crates/typst/src/foundations/dict.rs
+++ b/crates/typst/src/foundations/dict.rs
@@ -62,7 +62,7 @@ pub use crate::__dict as dict;
 /// #dict.insert("city", "Berlin ")
 /// #("name" in dict)
 /// ```
-#[ty(scope, name = "dictionary")]
+#[ty(scope, cast, name = "dictionary")]
 #[derive(Default, Clone, PartialEq)]
 pub struct Dict(Arc<IndexMap<Str, Value>>);
 
diff --git a/crates/typst/src/foundations/duration.rs b/crates/typst/src/foundations/duration.rs
index b6a48f3b..83e3d962 100644
--- a/crates/typst/src/foundations/duration.rs
+++ b/crates/typst/src/foundations/duration.rs
@@ -7,7 +7,7 @@ use time::ext::NumericalDuration;
 use crate::foundations::{func, repr, scope, ty, Repr};
 
 /// Represents a positive or negative span of time.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Duration(time::Duration);
 
diff --git a/crates/typst/src/foundations/float.rs b/crates/typst/src/foundations/float.rs
index 6bcebda8..723e023b 100644
--- a/crates/typst/src/foundations/float.rs
+++ b/crates/typst/src/foundations/float.rs
@@ -19,7 +19,7 @@ use crate::layout::Ratio;
 /// #1e4 \
 /// #(10 / 4)
 /// ```
-#[ty(scope, name = "float")]
+#[ty(scope, cast, name = "float")]
 type f64;
 
 #[scope]
diff --git a/crates/typst/src/foundations/func.rs b/crates/typst/src/foundations/func.rs
index 22a20fdb..70d0ec31 100644
--- a/crates/typst/src/foundations/func.rs
+++ b/crates/typst/src/foundations/func.rs
@@ -123,7 +123,7 @@ pub use typst_macros::func;
 /// The only exception are built-in methods like
 /// [`array.push(value)`]($array.push). These can modify the values they are
 /// called on.
-#[ty(scope, name = "function")]
+#[ty(scope, cast, name = "function")]
 #[derive(Clone, Hash)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Func {
diff --git a/crates/typst/src/foundations/int.rs b/crates/typst/src/foundations/int.rs
index 602cdd5a..9fffadbf 100644
--- a/crates/typst/src/foundations/int.rs
+++ b/crates/typst/src/foundations/int.rs
@@ -25,7 +25,7 @@ use crate::foundations::{cast, func, repr, scope, ty, Repr, Str, Value};
 /// #0o10 \
 /// #0b1001
 /// ```
-#[ty(scope, name = "int", title = "Integer")]
+#[ty(scope, cast, name = "int", title = "Integer")]
 type i64;
 
 #[scope]
diff --git a/crates/typst/src/foundations/label.rs b/crates/typst/src/foundations/label.rs
index 53914c35..9d84a564 100644
--- a/crates/typst/src/foundations/label.rs
+++ b/crates/typst/src/foundations/label.rs
@@ -31,7 +31,7 @@ use crate::util::PicoStr;
 ///
 /// Currently, labels can only be attached to elements in markup mode, not in
 /// code mode. This might change in the future.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Label(PicoStr);
 
diff --git a/crates/typst/src/foundations/module.rs b/crates/typst/src/foundations/module.rs
index 140618bc..3ec516d3 100644
--- a/crates/typst/src/foundations/module.rs
+++ b/crates/typst/src/foundations/module.rs
@@ -23,7 +23,7 @@ use crate::foundations::{repr, ty, Content, Scope, Value};
 /// >>>
 /// >>> #(-3)
 /// ```
-#[ty]
+#[ty(cast)]
 #[derive(Clone, Hash)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Module {
diff --git a/crates/typst/src/foundations/none.rs b/crates/typst/src/foundations/none.rs
index d03ca8fc..afb055a6 100644
--- a/crates/typst/src/foundations/none.rs
+++ b/crates/typst/src/foundations/none.rs
@@ -20,7 +20,7 @@ use crate::foundations::{
 /// ```example
 /// Not visible: #none
 /// ```
-#[ty(name = "none")]
+#[ty(cast, name = "none")]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct NoneValue;
 
diff --git a/crates/typst/src/foundations/plugin.rs b/crates/typst/src/foundations/plugin.rs
index 898ac6f8..80644ea5 100644
--- a/crates/typst/src/foundations/plugin.rs
+++ b/crates/typst/src/foundations/plugin.rs
@@ -115,7 +115,7 @@ use crate::World;
 /// - Wrappers to help you write your plugin in Rust (Zig wrapper in
 ///   development)
 /// - A stubber for WASI
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Clone)]
 pub struct Plugin(Arc<Repr>);
 
diff --git a/crates/typst/src/foundations/selector.rs b/crates/typst/src/foundations/selector.rs
index f0ab90ee..05bc480e 100644
--- a/crates/typst/src/foundations/selector.rs
+++ b/crates/typst/src/foundations/selector.rs
@@ -76,7 +76,7 @@ pub use crate::__select_where as select_where;
 /// == So will this
 /// === But this will not.
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Clone, PartialEq, Hash)]
 pub enum Selector {
     /// Matches a specific type of element.
diff --git a/crates/typst/src/foundations/str.rs b/crates/typst/src/foundations/str.rs
index 57eac74d..553c2170 100644
--- a/crates/typst/src/foundations/str.rs
+++ b/crates/typst/src/foundations/str.rs
@@ -67,7 +67,7 @@ pub use ecow::eco_format;
 /// - `[\r]` for a carriage return
 /// - `[\t]` for a tab
 /// - `[\u{1f600}]` for a hexadecimal Unicode escape sequence
-#[ty(scope, title = "String")]
+#[ty(scope, cast, title = "String")]
 #[derive(Default, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[derive(Serialize, Deserialize)]
 #[serde(transparent)]
@@ -898,10 +898,6 @@ impl Hash for Regex {
     }
 }
 
-cast! {
-    type Regex,
-}
-
 /// A pattern which can be searched for in a string.
 #[derive(Debug, Clone)]
 pub enum StrPattern {
diff --git a/crates/typst/src/foundations/styles.rs b/crates/typst/src/foundations/styles.rs
index 3fa9e9fb..771a3d2c 100644
--- a/crates/typst/src/foundations/styles.rs
+++ b/crates/typst/src/foundations/styles.rs
@@ -64,7 +64,7 @@ impl Show for StyleElem {
 }
 
 /// A list of style properties.
-#[ty]
+#[ty(cast)]
 #[derive(Default, PartialEq, Clone, Hash)]
 pub struct Styles(EcoVec<Prehashed<Style>>);
 
diff --git a/crates/typst/src/foundations/ty.rs b/crates/typst/src/foundations/ty.rs
index 4b9f19a9..485bfb45 100644
--- a/crates/typst/src/foundations/ty.rs
+++ b/crates/typst/src/foundations/ty.rs
@@ -53,7 +53,7 @@ pub use typst_macros::{scope, ty};
 /// - Adding/joining a type and string will yield a string
 /// - The `{in}` operator on a type and a dictionary will evaluate to `{true}`
 ///   if the dictionary has a string key matching the type's name
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Copy, Clone, Eq, PartialEq, Hash)]
 pub struct Type(Static<NativeTypeData>);
 
diff --git a/crates/typst/src/foundations/version.rs b/crates/typst/src/foundations/version.rs
index 98ad598b..6f5c350c 100644
--- a/crates/typst/src/foundations/version.rs
+++ b/crates/typst/src/foundations/version.rs
@@ -20,7 +20,7 @@ use crate::foundations::{cast, func, repr, scope, ty, Repr};
 ///
 /// You can convert a version to an array of explicitly given components using
 /// the [`array`]($array) constructor.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Default, Clone, Hash)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Version(EcoVec<u32>);
diff --git a/crates/typst/src/introspection/counter.rs b/crates/typst/src/introspection/counter.rs
index 0de1ecae..0f319fab 100644
--- a/crates/typst/src/introspection/counter.rs
+++ b/crates/typst/src/introspection/counter.rs
@@ -475,10 +475,6 @@ impl Repr for Counter {
     }
 }
 
-cast! {
-    type Counter,
-}
-
 /// Identifies a counter.
 #[derive(Debug, Clone, PartialEq, Hash)]
 pub enum CounterKey {
@@ -521,7 +517,7 @@ impl Repr for CounterKey {
 }
 
 /// An update to perform on a counter.
-#[ty]
+#[ty(cast)]
 #[derive(Debug, Clone, PartialEq, Hash)]
 pub enum CounterUpdate {
     /// Set the counter to the specified state.
diff --git a/crates/typst/src/introspection/location.rs b/crates/typst/src/introspection/location.rs
index 0ceaac8b..23ed81d6 100644
--- a/crates/typst/src/introspection/location.rs
+++ b/crates/typst/src/introspection/location.rs
@@ -3,7 +3,7 @@ use std::num::NonZeroUsize;
 use ecow::EcoString;
 
 use crate::engine::Engine;
-use crate::foundations::{cast, func, scope, ty, Dict, Repr};
+use crate::foundations::{func, scope, ty, Dict, Repr};
 use crate::model::Numbering;
 
 /// Identifies an element in the document.
@@ -79,9 +79,5 @@ impl Repr for Location {
     }
 }
 
-cast! {
-    type Location,
-}
-
 /// Makes this element locatable through `engine.locate`.
 pub trait Locatable {}
diff --git a/crates/typst/src/introspection/mod.rs b/crates/typst/src/introspection/mod.rs
index 0f5d11b1..86917891 100644
--- a/crates/typst/src/introspection/mod.rs
+++ b/crates/typst/src/introspection/mod.rs
@@ -26,8 +26,7 @@ use ecow::{eco_format, EcoString};
 use smallvec::SmallVec;
 
 use crate::foundations::{
-    cast, category, elem, ty, Behave, Behaviour, Category, Content, Repr, Scope,
-    Unlabellable,
+    category, elem, ty, Behave, Behaviour, Category, Content, Repr, Scope, Unlabellable,
 };
 use crate::layout::PdfPageLabel;
 use crate::model::{Destination, Numbering};
@@ -89,10 +88,6 @@ pub enum Meta {
     Hide,
 }
 
-cast! {
-    type Meta,
-}
-
 impl Debug for Meta {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
diff --git a/crates/typst/src/introspection/state.rs b/crates/typst/src/introspection/state.rs
index c1264f1c..3d050fb0 100644
--- a/crates/typst/src/introspection/state.rs
+++ b/crates/typst/src/introspection/state.rs
@@ -351,12 +351,8 @@ impl Repr for State {
     }
 }
 
-cast! {
-    type State,
-}
-
 /// An update to perform on a state.
-#[ty]
+#[ty(cast)]
 #[derive(Debug, Clone, PartialEq, Hash)]
 pub enum StateUpdate {
     /// Set the state to the specified value.
diff --git a/crates/typst/src/layout/align.rs b/crates/typst/src/layout/align.rs
index 052ac49f..a1f2a553 100644
--- a/crates/typst/src/layout/align.rs
+++ b/crates/typst/src/layout/align.rs
@@ -245,10 +245,6 @@ impl From<Side> for Alignment {
     }
 }
 
-cast! {
-    type Alignment,
-}
-
 /// Where to align something horizontally.
 #[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
 pub enum HAlignment {
diff --git a/crates/typst/src/layout/angle.rs b/crates/typst/src/layout/angle.rs
index e6ed9a58..1cded9a3 100644
--- a/crates/typst/src/layout/angle.rs
+++ b/crates/typst/src/layout/angle.rs
@@ -19,7 +19,7 @@ use crate::util::{Numeric, Scalar};
 /// ```example
 /// #rotate(10deg)[Hello there!]
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Angle(Scalar);
 
diff --git a/crates/typst/src/layout/dir.rs b/crates/typst/src/layout/dir.rs
index 569c1880..9a2e7710 100644
--- a/crates/typst/src/layout/dir.rs
+++ b/crates/typst/src/layout/dir.rs
@@ -1,6 +1,6 @@
 use ecow::EcoString;
 
-use crate::foundations::{cast, func, scope, ty, Repr};
+use crate::foundations::{func, scope, ty, Repr};
 use crate::layout::{Axis, Side};
 
 /// The four directions into which content can be laid out.
@@ -130,7 +130,3 @@ impl Repr for Dir {
         }
     }
 }
-
-cast! {
-    type Dir,
-}
diff --git a/crates/typst/src/layout/fr.rs b/crates/typst/src/layout/fr.rs
index 24fe77f8..23f5cf62 100644
--- a/crates/typst/src/layout/fr.rs
+++ b/crates/typst/src/layout/fr.rs
@@ -20,7 +20,7 @@ use crate::util::{Numeric, Scalar};
 /// ```example
 /// Left #h(1fr) Left-ish #h(2fr) Right
 /// ```
-#[ty(name = "fraction")]
+#[ty(cast, name = "fraction")]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Fr(Scalar);
 
diff --git a/crates/typst/src/layout/length.rs b/crates/typst/src/layout/length.rs
index 26b9320b..94e85248 100644
--- a/crates/typst/src/layout/length.rs
+++ b/crates/typst/src/layout/length.rs
@@ -38,7 +38,7 @@ use crate::util::Numeric;
 /// - `abs`: A length with just the absolute component of the current length
 ///   (that is, excluding the `em` component).
 /// - `em`: The amount of `em` units in this length, as a [float]($float).
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
 pub struct Length {
     /// The absolute part.
diff --git a/crates/typst/src/layout/ratio.rs b/crates/typst/src/layout/ratio.rs
index b535df38..8b4e72d4 100644
--- a/crates/typst/src/layout/ratio.rs
+++ b/crates/typst/src/layout/ratio.rs
@@ -17,7 +17,7 @@ use crate::util::{Numeric, Scalar};
 ///   Scaled apart.
 /// ]
 /// ```
-#[ty]
+#[ty(cast)]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct Ratio(Scalar);
 
diff --git a/crates/typst/src/layout/rel.rs b/crates/typst/src/layout/rel.rs
index 7769f858..8f937102 100644
--- a/crates/typst/src/layout/rel.rs
+++ b/crates/typst/src/layout/rel.rs
@@ -25,7 +25,7 @@ use crate::util::Numeric;
 /// A relative length has the following fields:
 /// - `length`: Its length component.
 /// - `ratio`: Its ratio component.
-#[ty(name = "relative", title = "Relative Length")]
+#[ty(cast, name = "relative", title = "Relative Length")]
 #[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
 pub struct Rel<T: Numeric = Length> {
     /// The relative part.
diff --git a/crates/typst/src/model/bibliography.rs b/crates/typst/src/model/bibliography.rs
index 62e6d986..6ec43b66 100644
--- a/crates/typst/src/model/bibliography.rs
+++ b/crates/typst/src/model/bibliography.rs
@@ -421,10 +421,6 @@ impl Repr for Bibliography {
     }
 }
 
-cast! {
-    type Bibliography,
-}
-
 /// Format a BibLaTeX loading error.
 fn format_biblatex_error(path: &str, src: &str, errors: Vec<BibLaTeXError>) -> EcoString {
     let Some(error) = errors.first() else {
@@ -440,7 +436,7 @@ fn format_biblatex_error(path: &str, src: &str, errors: Vec<BibLaTeXError>) -> E
 }
 
 /// A loaded CSL style.
-#[ty]
+#[ty(cast)]
 #[derive(Debug, Clone, PartialEq, Hash)]
 pub struct CslStyle {
     name: Option<EcoString>,
diff --git a/crates/typst/src/symbols/symbol.rs b/crates/typst/src/symbols/symbol.rs
index 4ba60382..73bdd286 100644
--- a/crates/typst/src/symbols/symbol.rs
+++ b/crates/typst/src/symbols/symbol.rs
@@ -42,7 +42,7 @@ pub use typst_macros::symbols;
 /// $arrow.r$ \
 /// $arrow.t.quad$
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub struct Symbol(Repr);
 
diff --git a/crates/typst/src/text/deco.rs b/crates/typst/src/text/deco.rs
index 4aced36d..0968782e 100644
--- a/crates/typst/src/text/deco.rs
+++ b/crates/typst/src/text/deco.rs
@@ -5,7 +5,7 @@ use ecow::{eco_format, EcoString};
 
 use crate::diag::SourceResult;
 use crate::engine::Engine;
-use crate::foundations::{cast, elem, ty, Content, Fold, Repr, Show, Smart, StyleChain};
+use crate::foundations::{elem, ty, Content, Fold, Repr, Show, Smart, StyleChain};
 use crate::layout::{Abs, Em, Frame, FrameItem, Length, Point, Size};
 use crate::syntax::Span;
 use crate::text::{
@@ -363,10 +363,6 @@ impl Repr for Decoration {
     }
 }
 
-cast! {
-    type Decoration,
-}
-
 /// A kind of decorative line.
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 enum DecoLine {
diff --git a/crates/typst/src/visualize/color.rs b/crates/typst/src/visualize/color.rs
index 0f50432b..a8b51cee 100644
--- a/crates/typst/src/visualize/color.rs
+++ b/crates/typst/src/visualize/color.rs
@@ -163,7 +163,7 @@ const ANGLE_EPSILON: f32 = 1e-5;
 ///   )
 /// }))
 /// ```
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Copy, Clone)]
 pub enum Color {
     /// A 32-bit luma color.
diff --git a/crates/typst/src/visualize/gradient.rs b/crates/typst/src/visualize/gradient.rs
index 623cc368..da747026 100644
--- a/crates/typst/src/visualize/gradient.rs
+++ b/crates/typst/src/visualize/gradient.rs
@@ -175,7 +175,7 @@ use crate::visualize::{Color, ColorSpace, WeightedColor};
 ///   [`color.oklab`]($color.oklab) colors with extra stops in between. This
 ///   avoids needing to encode these color spaces in your PDF file, but it does
 ///   add extra stops to your gradient, which can increase the file size.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Clone, PartialEq, Eq, Hash)]
 pub enum Gradient {
     Linear(Arc<LinearGradient>),
diff --git a/crates/typst/src/visualize/pattern.rs b/crates/typst/src/visualize/pattern.rs
index a181ad0d..4da1cd61 100644
--- a/crates/typst/src/visualize/pattern.rs
+++ b/crates/typst/src/visualize/pattern.rs
@@ -95,7 +95,7 @@ use crate::World;
 ///   that are implicitly created by show rules and elements. For example, a
 ///   [`rotate`]($rotate) will not affect the parent of a gradient, but a
 ///   [`grid`]($grid) will.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub struct Pattern(Arc<Repr>);
 
diff --git a/crates/typst/src/visualize/stroke.rs b/crates/typst/src/visualize/stroke.rs
index 3686831d..1d43a7b3 100644
--- a/crates/typst/src/visualize/stroke.rs
+++ b/crates/typst/src/visualize/stroke.rs
@@ -49,7 +49,7 @@ use crate::visualize::{Color, Gradient, Paint, Pattern};
 /// constructor function. For example, `{(2pt + blue).thickness}` is `{2pt}`.
 /// Meanwhile, `{stroke(red).cap}` is `{auto}` because it's unspecified. Fields
 /// set to `{auto}` are inherited.
-#[ty(scope)]
+#[ty(scope, cast)]
 #[derive(Debug, Default, Clone, Eq, PartialEq, Hash)]
 pub struct Stroke<T: Numeric = Length> {
     /// The stroke's paint.