function values as comptime params

TODO.md

@@ -878,7 +878,7 @@
   - equal structural values reuse specializations and stable emitted names, distinct values
     specialize separately, aggregate inference uses exact type-factory provenance, and all
     comptime parameters remain erased from the runtime ABI
-  - undefined values, pointers, functions, general slices, fallibles, ranges, and untagged
+  - undefined values, pointers, general slices, fallibles, ranges, and untagged
     unions diagnose that they have no stable comptime identity
   - `@std/meta.TypeInfo.enum` carries declaration-ordered `EnumInfo.fields`, enabling enum
     formatting through `field!` without runtime reflection metadata
@@ -913,6 +913,14 @@
   - native unsigned scalars and target-classified unsigned C scalars satisfy the constraint
   - `isize` and `usize` remain concrete pointer-sized types
 
+43. comptime function parameters (implemented)
+  - concrete native and C function values, function literals, and aggregates containing them
+    specialize by declaration identity rather than runtime address
+  - repeated declarations reuse specializations, distinct declarations specialize separately, and
+    function-valued parameters remain erased from the runtime ABI
+  - statically known callback invocations lower to direct calls; runtime-selected function pointers
+    remain indirect, and bodyless C declarations remain runtime-only during comptime execution
+
 ## A word on unchecked casts
 
 For casts that bypass safety checks, Honey provides builtin functions: