function values as comptime params

LANGUAGE.md

@@ -155,7 +155,7 @@ as `math.divfloor(a, b)` resolve to ordinary functions.
 - demand-monomorphized Brolang and C-ABI functions
 - integer comptime value parameters such as `make_array func($N usize) [N]u8`, specialized by value and omitted from the runtime ABI
 - explicit comptime type parameters such as `max func($T type, a, b T) T`, specialized by type and omitted from the runtime ABI
-- comptime parameters may appear anywhere, are erased from the runtime ABI, and accept recursively stable booleans, integers, floats, types, immutable bytes, enums, fixed arrays, records/tuples, optionals, and tagged unions; equal structural values share specializations, while pointers, functions, general slices, fallibles, ranges, untagged unions, and undefined values have no stable comptime identity
+- comptime parameters may appear anywhere, are erased from the runtime ABI, and accept recursively stable booleans, integers, floats, types, immutable bytes, enums, fixed arrays, records/tuples, optionals, tagged unions, and concrete function values; equal structural values and function declarations share specializations, while pointers, general slices, fallibles, ranges, untagged unions, and undefined values have no stable comptime identity
 - comptime parameters may be omitted when uniquely recoverable from runtime arguments, the immediate expected result, or exact type-factory provenance; `_` is an explicit inference hole
 - forced typed comptime expressions such as `$sum(1, 2)`, `$Point { x = 1, y = 2 }`, and comptime value blocks such as `${ yield 4 }`
 - comptime execution for bodyful Brolang functions with mutable locals, loops, `defer`, `match`, `try`/`catch`, pointer/slice storage mutation, pointer captures, and calls through comptime-known function values; `undefined` storage may be initialized at comptime, but remaining poison cannot be observed
@@ -165,7 +165,7 @@ as `math.divfloor(a, b)` resolve to ordinary functions.
 - `tag!(value)` reads a tagged union's active discriminant and folds when the value is comptime-known; `tagname!(enum_value)` requires a comptime-known enum value and returns its immutable declaration name
 - bodyful `c_func` definitions and bodyless `c_func` declarations with exact external symbol names
 - concrete-only C signatures, C variadic declarations/calls, and C default argument promotions
-- native function pointer values and types with `@func(...) R`, fallible `@func(...) R ! E`, optional `?@func(...) R`, and non-variadic native indirect calls
+- native function pointer values and types with `@func(...) R`, fallible `@func(...) R ! E`, optional `?@func(...) R`, comptime specialization by declaration identity, and non-variadic native indirect calls when the target is not statically known
 - Apple Silicon C ABI lowering for scalars, pointers, fixed-signature plain records/unions, small aggregates, homogeneous float aggregates, and indirect aggregate returns
 - imported C typedefs, scalar constants, enum constants, fixed arrays, complete plain structs/unions, C `void*` as nullable `anyopaque` pointers, and pointers to opaque records
 - imported external C object variables, including mutable variables and immutable object globals