Name the erased repark and replay function types

node-graph/libraries/core-types/src/attribute.rs

@@ -48,7 +48,7 @@ pub trait Attribute: 'static {
 
 	/// Re-parks the owned clone [`Self::read_erased`] produced into fresh
 	/// field storage; `None` for plain values, which ride the byte copy.
-	const REPARK: Option<unsafe fn(&dyn AnyAttributeValue, *mut u8, &crate::arena::Arena) -> Option<()>> = None;
+	const REPARK: Option<crate::list::ReparkFn> = None;
 }
 
 /// A kernel-facing attribute value. A parameter `Attr<A>` is a read of `A`

node-graph/libraries/core-types/src/list.rs

@@ -85,6 +85,12 @@ pub trait AnyAttributeValue: std::any::Any + Send + Sync {
 	fn into_attribute(self: Box<Self>, key: &str, preceding_defaults: usize) -> Box<dyn AnyAttribute>;
 }
 
+/// Re-parks an owned attribute value into fresh field storage; `None` reports arena exhaustion.
+pub type ReparkFn = unsafe fn(&dyn AnyAttributeValue, *mut u8, &crate::arena::Arena) -> Option<()>;
+
+/// Replays an owned attribute value into a serving arena; `Some(None)` is unchanged, `None` reports arena exhaustion.
+pub type FieldReplayFn = fn(&dyn AnyAttributeValue, &crate::arena::Arena) -> Option<Option<Box<dyn AnyAttributeValue>>>;
+
 impl<T: Clone + Send + Sync + Default + Sized + Debug + PartialEq + CacheHash + 'static> AnyAttributeValue for T {
 	/// Clones this value into a new boxed trait object.
 	fn clone_box(&self) -> Box<dyn AnyAttributeValue> {

node-graph/libraries/core-types/src/record/layout.rs

@@ -15,7 +15,7 @@ pub struct FieldWrite {
 	pub align: usize,
 	pub type_id: std::any::TypeId,
 	pub read_erased: unsafe fn(*const u8) -> Box<dyn crate::list::AnyAttributeValue>,
-	pub repark: Option<unsafe fn(&dyn crate::list::AnyAttributeValue, *mut u8, &crate::arena::Arena) -> Option<()>>,
+	pub repark: Option<crate::list::ReparkFn>,
 	/// Hashes the field's content. `None` means the stored bytes are the
 	/// content, which holds for every unparked value.
 	pub content_hash: Option<unsafe fn(*const u8, &mut dyn core::hash::Hasher)>,
@@ -64,7 +64,7 @@ pub struct FieldDesc {
 	pub align: usize,
 	pub type_id: std::any::TypeId,
 	pub read_erased: unsafe fn(*const u8) -> Box<dyn crate::list::AnyAttributeValue>,
-	pub repark: Option<unsafe fn(&dyn crate::list::AnyAttributeValue, *mut u8, &crate::arena::Arena) -> Option<()>>,
+	pub repark: Option<crate::list::ReparkFn>,
 	/// Hashes the field's content. `None` means the stored bytes are the
 	/// content, which holds for every unparked value.
 	pub content_hash: Option<unsafe fn(*const u8, &mut dyn core::hash::Hasher)>,

node-graph/libraries/core-types/src/record/owned.rs

@@ -43,7 +43,7 @@ pub(in crate::record) fn deep_element_glue(type_id: std::any::TypeId) -> Option<
 #[derive(Clone, Copy)]
 pub(in crate::record) struct DeepFieldGlue {
 	pub(in crate::record) copy_out: fn(&dyn crate::list::AnyAttributeValue) -> Option<Box<dyn crate::list::AnyAttributeValue>>,
-	pub(in crate::record) replay: fn(&dyn crate::list::AnyAttributeValue, &crate::arena::Arena) -> Option<Option<Box<dyn crate::list::AnyAttributeValue>>>,
+	pub(in crate::record) replay: crate::list::FieldReplayFn,
 }
 
 static DEEP_FIELD_VALUES: std::sync::LazyLock<std::sync::Mutex<std::collections::HashMap<std::any::TypeId, DeepFieldGlue>>> = std::sync::LazyLock::new(Default::default);
@@ -52,7 +52,7 @@ static DEEP_FIELD_VALUES: std::sync::LazyLock<std::sync::Mutex<std::collections:
 /// Called at startup from the crate that owns the type.
 pub fn register_deep_field_value<T: 'static>(
 	copy_out: fn(&dyn crate::list::AnyAttributeValue) -> Option<Box<dyn crate::list::AnyAttributeValue>>,
-	replay: fn(&dyn crate::list::AnyAttributeValue, &crate::arena::Arena) -> Option<Option<Box<dyn crate::list::AnyAttributeValue>>>,
+	replay: crate::list::FieldReplayFn,
 ) {
 	DEEP_FIELD_VALUES.lock().unwrap().insert(std::any::TypeId::of::<T>(), DeepFieldGlue { copy_out, replay });
 }