smalltalk: String>>format: + universal printOn: + 18 tests

lib/smalltalk/runtime.sx

@@ -479,8 +479,9 @@
         (st-parse-method "isEmpty ^ self size = 0"))
       (st-class-add-method! "SequenceableCollection" "notEmpty"
         (st-parse-method "notEmpty ^ self size > 0"))
-      (st-class-add-method! "SequenceableCollection" "asString"
-        (st-parse-method "asString ^ self printString"))
+      ;; (no asString here — Symbol/String have their own primitive
+      ;; impls; SequenceableCollection-level fallback would overwrite
+      ;; the bare-name-for-Symbol behaviour.)
       ;; ── HashedCollection / Set / Dictionary ──
       ;; Implemented as user instances with array-backed storage. Sets
       ;; use a single `array` ivar; Dictionaries use parallel `keys`/