sentinel pointers and c strings

LANGUAGE.md

@@ -17,11 +17,15 @@
 - C primitives remain semantically distinct from exact-width Brolang primitives until target lowering
 - contextual integer literals and constant folding of addition and negation trees
 - strict numeric conversions, checked integer addition, and unary negation
-- arrays `[N]T`, sentinel arrays `[N;S]T`, indexing, pointers, pointer offsets, slices, and explicit slicing
-- immutable UTF-8 sentinel-slice strings and Unicode code-point character literals
+- arrays `[N]T`, sentinel arrays `[N;S]T`, single-item pointers `@T`, many-item pointers `*T`, sentinel many-item pointers `[*;S]T`, pointer offsets, slices, and explicit slicing
+- immutable UTF-8 string literals typed as pointers to static sentinel arrays: `@[N;0]u8`
+- pointer-to-array `.len`, indexing, and slicing without explicit dereference
+- arrays expose `.len` but not `.ptr`; slices and pointers-to-arrays expose `.ptr` and preserve sentinel information when available
+- information-preserving and information-forgetting pointer-to-array decay and sentinel slice/pointer weakening; array values never implicitly decay
+- narrow immutable zero-terminated byte pointer conversion to `*c_char` and `[*;0]c_char`, without general `u8`/`c_char` interchange
 - optionals with trapping postfix `?`, `orelse`, and nullable pointer representation
 - source-order native structs, keyed literals, and defined or opaque pointer-only `c_struct`
-- postfix pointer dereference, explicit `.ptr`/`.len`, general writable locations, function calls, assignments, and returns
+- postfix pointer dereference, general writable locations, function calls, assignments, and returns
 
 ### functions and packages