feat(apb): optional Send marker on Base, on by default

apb/Cargo.toml

@@ -24,13 +24,14 @@ sea-orm = { version = "0.12", optional = true }
 reqwest = { version = "0.12", features = ["json"], optional = true }
 
 [features]
-default = ["activitypub-miscellaneous-terms"]
+default = ["activitypub-miscellaneous-terms", "send"]
 # extensions
 activitypub-miscellaneous-terms = [] # https://swicg.github.io/miscellany/
 activitypub-counters = [] # https://ns.alemi.dev/as/counters/#
 activitypub-fe = [] # https://ns.alemi.dev/as/fe/#
 litepub = [] # incomplete, https://litepub.social/
 # builtin utils
+send = []
 orm = ["dep:sea-orm"]
 fetch = ["dep:reqwest"]
 # providers

apb/src/macros.rs

@@ -1,3 +1,15 @@
+#[cfg(feature = "send")]
+pub trait MaybeSend : Send {}
+#[cfg(feature = "send")]
+impl<T : Send> MaybeSend for T {}
+
+
+#[cfg(not(feature = "send"))]
+pub trait MaybeSend {}
+#[cfg(not(feature = "send"))]
+impl<T> MaybeSend for T {}
+
+
 #[derive(Debug, thiserror::Error)]
 #[error("invalid type value")]
 pub struct TypeValueError;

apb/src/types/base.rs

@@ -8,13 +8,13 @@ crate::strenum! {
 	};
 }
 
-pub trait Base {
+pub trait Base : crate::macros::MaybeSend {
 	fn id(&self) -> Option<&str> { None }
 	fn base_type(&self) -> Option<BaseType> { None }
 }
 
 
-pub trait BaseMut {
+pub trait BaseMut : crate::macros::MaybeSend {
 	fn set_id(self, val: Option<&str>) -> Self;
 	fn set_base_type(self, val: Option<BaseType>) -> Self;
 }