js-on-sx: js-num-from-string uses pow (float) for exponent

js-pow-int 10 20 overflows int64 (10^20 > 2^63), so numeric literals
like 1e20 and 100000000000000000000 were parsing as
-1457092405402533888. The pow primitive uses float-domain
exponentiation and produces 1e+20 correctly. Single call swap in
js-num-from-string. built-ins/String (with --restart-every 1):
67/99 → 70/99. conformance.sh: 148/148.

lib/js/runtime.sx

@@ -1073,7 +1073,8 @@
       ((trimmed (js-trim s)))
       (cond
         ((= trimmed "") 0)
-        ((js-hex-prefix? trimmed) (js-parse-hex trimmed 2 0))
+        ((js-hex-prefix? trimmed)
+          (js-parse-hex trimmed 2 0))
         (else
           (let
             ((esplit (js-find-exp-char trimmed)))
@@ -1082,12 +1083,28 @@
               (let
                 ((mant (js-string-slice trimmed 0 esplit))
                   (expstr
-                    (js-string-slice trimmed (+ esplit 1) (len trimmed))))
+                    (js-string-slice
+                      trimmed
+                      (+ esplit 1)
+                      (len trimmed))))
                 (let
                   ((m (js-parse-decimal mant 0 0 1 false 0))
-                    (e (js-parse-decimal expstr 0 0 1 false 0)))
-                  (* m (js-pow-int 10 e))))
-              (js-parse-decimal trimmed 0 0 1 false 0))))))))
+                    (e
+                      (js-parse-decimal
+                        expstr
+                        0
+                        0
+                        1
+                        false
+                        0)))
+                  (* m (pow 10 e))))
+              (js-parse-decimal
+                trimmed
+                0
+                0
+                1
+                false
+                0))))))))
 
 (define js-trim (fn (s) (js-trim-left (js-trim-right s))))
 

lib/js/test262-scoreboard.json

@@ -1,9 +1,9 @@
 {
   "totals": {
     "pass": 67,
-    "fail": 19,
+    "fail": 26,
     "skip": 1,
-    "timeout": 13,
+    "timeout": 6,
     "total": 100,
     "runnable": 99,
     "pass_rate": 67.7
@@ -13,18 +13,22 @@
       "category": "built-ins/String",
       "total": 100,
       "pass": 67,
-      "fail": 19,
+      "fail": 26,
       "skip": 1,
-      "timeout": 13,
+      "timeout": 6,
       "pass_rate": 67.7,
       "top_failures": [
         [
           "Test262Error (assertion failed)",
-          15
+          14
+        ],
+        [
+          "TypeError: not a function",
+          8
         ],
         [
           "Timeout",
-          13
+          6
         ],
         [
           "Unhandled: Not callable: \\\\\\",
@@ -33,10 +37,6 @@
         [
           "ReferenceError (undefined symbol)",
           1
-        ],
-        [
-          "SyntaxError (parse/unsupported syntax)",
-          1
         ]
       ]
     }
@@ -44,11 +44,15 @@
   "top_failure_modes": [
     [
       "Test262Error (assertion failed)",
-      15
+      14
+    ],
+    [
+      "TypeError: not a function",
+      8
     ],
     [
       "Timeout",
-      13
+      6
     ],
     [
       "Unhandled: Not callable: \\\\\\",
@@ -64,6 +68,6 @@
     ]
   ],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 580.2,
+  "elapsed_seconds": 364.7,
   "workers": 1
 }

lib/js/test262-scoreboard.md

@@ -1,14 +1,15 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 580.2s
+Wall time: 364.7s
 
-**Total:** 67/99 runnable passed (67.7%). Raw: pass=67 fail=19 skip=1 timeout=13 total=100.
+**Total:** 67/99 runnable passed (67.7%). Raw: pass=67 fail=26 skip=1 timeout=6 total=100.
 
 ## Top failure modes
 
-- **15x** Test262Error (assertion failed)
-- **13x** Timeout
+- **14x** Test262Error (assertion failed)
+- **8x** TypeError: not a function
+- **6x** Timeout
 - **2x** Unhandled: Not callable: \\\
 - **1x** ReferenceError (undefined symbol)
 - **1x** SyntaxError (parse/unsupported syntax)
@@ -17,14 +18,14 @@ Wall time: 580.2s
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/String | 67 | 19 | 1 | 13 | 100 | 67.7% |
+| built-ins/String | 67 | 26 | 1 | 6 | 100 | 67.7% |
 
 ## Per-category top failures (min 10 runnable, worst first)
 
 ### built-ins/String  (67/99 — 67.7%)
 
-- **15x** Test262Error (assertion failed)
-- **13x** Timeout
+- **14x** Test262Error (assertion failed)
+- **8x** TypeError: not a function
+- **6x** Timeout
 - **2x** Unhandled: Not callable: \\\
 - **1x** ReferenceError (undefined symbol)
-- **1x** SyntaxError (parse/unsupported syntax)