js-on-sx: .toString()/.toFixed()/.valueOf() on numbers and booleans

js-invoke-method now branches on (number? recv) and (boolean? recv) before
falling through to the generic dict/fn path. js-invoke-number-method handles
toString (incl. radix 2-36), toFixed, valueOf, toLocaleString, toPrecision,
toExponential. js-invoke-boolean-method handles toString and valueOf.

Numbers had no .toString() on bare values before — (5).toString() crashed
with 'TypeError: toString is not a function'. This is one of the bigger
scoreboard misses on built-ins/Number category.

10 new unit tests, 469/471 total.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/js/test.sh

@@ -1169,6 +1169,28 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 3405)
 (eval "(js-eval \"var arr2 = [1,2]; Array.prototype.push.call(arr2, 10, 20); arr2.length\")")
 
+;; ── Phase 11.nummethod: .toString(), .toFixed() on numbers ───
+(epoch 3600)
+(eval "(js-eval \"(5).toString()\")")
+(epoch 3601)
+(eval "(js-eval \"(16).toString(16)\")")
+(epoch 3602)
+(eval "(js-eval \"(10).toString(2)\")")
+(epoch 3603)
+(eval "(js-eval \"(3.14).toFixed(1)\")")
+(epoch 3604)
+(eval "(js-eval \"(3.14).toFixed(2)\")")
+(epoch 3605)
+(eval "(js-eval \"(0).toFixed(3)\")")
+(epoch 3606)
+(eval "(js-eval \"(7).valueOf()\")")
+(epoch 3607)
+(eval "(js-eval \"true.toString()\")")
+(epoch 3608)
+(eval "(js-eval \"false.toString()\")")
+(epoch 3609)
+(eval "(js-eval \"(true).valueOf()\")")
+
 ;; ── Phase 11.arrlike: Array.prototype.* on {length, 0:..., 1:...} ──
 (epoch 3500)
 (eval "(js-eval \"var a = {length: 3, 0: 41, 1: 42, 2: 43}; Array.prototype.slice.call(a).length\")")
@@ -1819,6 +1841,18 @@ check 3403 "fn.call this-binding"          '42'
 check 3404 "fn.apply arg-unpack"           '7'
 check 3405 "Array.prototype.push.call arr" '4'
 
+# ── Phase 11.nummethod: number/boolean methods ────────────────
+check 3600 "(5).toString()"                '"5"'
+check 3601 "(16).toString(16)"             '"10"'
+check 3602 "(10).toString(2)"              '"1010"'
+check 3603 "(3.14).toFixed(1)"             '"3.1"'
+check 3604 "(3.14).toFixed(2)"             '"3.14"'
+check 3605 "(0).toFixed(3)"                '"0.000"'
+check 3606 "(7).valueOf()"                 '7'
+check 3607 "true.toString()"               '"true"'
+check 3608 "false.toString()"              '"false"'
+check 3609 "(true).valueOf()"              'true'
+
 # ── Phase 11.arrlike: array-like receivers on Array.prototype ─
 check 3500 "slice.call arrLike length"     '3'
 check 3501 "slice.call arrLike join"       '"41,42,43"'