js-on-sx: String.fromCharCode + parseInt + parseFloat

String global with fromCharCode (variadic). parseInt truncates via
js-math-trunc; parseFloat delegates to js-to-number. Wired into
js-global.

381/383 unit (+5), 148/148 slice unchanged.

plans/js-on-sx.md

@@ -185,6 +185,8 @@ Append-only record of completed iterations. Loop writes one line per iteration:
 
 - 2026-04-23 — **More Array.prototype + Object fallbacks (`hasOwnProperty` etc).** Array: `includes`, `find`, `findIndex`, `some`, `every`, `reverse` (in `js-array-method` dispatch + `js-get-prop` list-branch keys). Helpers: `js-list-find-loop / -find-index-loop / -some-loop / -every-loop / -reverse-loop` all tail-recursive, no `while` because SX doesn't have one. Object fallbacks: `js-invoke-method` now falls back to `js-invoke-object-method` for dicts when js-get-prop returns undefined AND the method name is in the builtin set (`hasOwnProperty`, `isPrototypeOf`, `propertyIsEnumerable`, `toString`, `valueOf`, `toLocaleString`). `hasOwnProperty` checks `(contains? (keys recv) (js-to-string k))`. This lets `o.hasOwnProperty('x')` work on plain dicts without having to install an Object.prototype. 13 new tests, **376/378** (363→+13). Conformance unchanged.
 
+- 2026-04-23 — **`String.fromCharCode`, `parseInt`, `parseFloat`.** `String` global with `fromCharCode` (variadic, loops through args and concatenates via `js-code-to-char`). `parseInt` truncates toward zero via `js-math-trunc`; `parseFloat` delegates to `js-to-number`. Wired into `js-global`. 5 new tests, **381/383** (376→+5). Conformance unchanged.
+
 ## Phase 3-5 gotchas
 
 Worth remembering for later phases: