js-on-sx: native prototypes carry wrapped primitive marker

Per ES, Boolean.prototype is a Boolean wrapper around false,
Number.prototype wraps 0, String.prototype wraps "". So
Boolean.prototype == false (loose-eq unwraps), and
Object.prototype.toString.call(Number.prototype) ===
"[object Number]". Set __js_*_value__ on each in post-init.
built-ins/Boolean: 23/27 → 24/27, String: 80/99 → 84/99.
conformance.sh: 148/148.

lib/js/runtime.sx

@@ -4651,6 +4651,9 @@
   (dict-set! (get Number "prototype") "__proto__" (get Object "prototype"))
   (dict-set! (get String "prototype") "__proto__" (get Object "prototype"))
   (dict-set! (get Boolean "prototype") "__proto__" (get Object "prototype"))
-  (dict-set! (get js-function-global "prototype") "__proto__" (get Object "prototype")))
+  (dict-set! (get js-function-global "prototype") "__proto__" (get Object "prototype"))
+  (dict-set! (get Number "prototype") "__js_number_value__" 0)
+  (dict-set! (get String "prototype") "__js_string_value__" "")
+  (dict-set! (get Boolean "prototype") "__js_boolean_value__" false))
 
 (define js-global {:undefined js-undefined :JSON JSON :parseInt parseInt :Object Object :isNaN js-global-is-nan :Infinity inf :NaN 0 :String String :Boolean Boolean :Array Array :Math Math :parseFloat parseFloat :Number Number :console console :isFinite js-global-is-finite})

lib/js/test262-scoreboard.json

@@ -1,45 +1,61 @@
 {
   "totals": {
-    "pass": 46,
-    "fail": 2,
-    "skip": 0,
-    "timeout": 2,
-    "total": 50,
-    "runnable": 50,
-    "pass_rate": 92.0
+    "pass": 84,
+    "fail": 12,
+    "skip": 1,
+    "timeout": 3,
+    "total": 100,
+    "runnable": 99,
+    "pass_rate": 84.8
   },
   "categories": [
     {
-      "category": "built-ins/Number",
-      "total": 50,
-      "pass": 46,
-      "fail": 2,
-      "skip": 0,
-      "timeout": 2,
-      "pass_rate": 92.0,
+      "category": "built-ins/String",
+      "total": 100,
+      "pass": 84,
+      "fail": 12,
+      "skip": 1,
+      "timeout": 3,
+      "pass_rate": 84.8,
       "top_failures": [
         [
-          "Timeout",
-          2
+          "Test262Error (assertion failed)",
+          10
         ],
         [
-          "Test262Error (assertion failed)",
-          2
+          "Timeout",
+          3
+        ],
+        [
+          "ReferenceError (undefined symbol)",
+          1
+        ],
+        [
+          "SyntaxError (parse/unsupported syntax)",
+          1
         ]
       ]
     }
   ],
   "top_failure_modes": [
     [
-      "Timeout",
-      2
+      "Test262Error (assertion failed)",
+      10
     ],
     [
-      "Test262Error (assertion failed)",
-      2
+      "Timeout",
+      3
+    ],
+    [
+      "ReferenceError (undefined symbol)",
+      1
+    ],
+    [
+      "SyntaxError (parse/unsupported syntax)",
+      1
     ]
   ],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 90.4,
+  "elapsed_seconds": 192.4,
   "workers": 1
 }

lib/js/test262-scoreboard.md

@@ -1,24 +1,28 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 90.4s
+Wall time: 192.4s
 
-**Total:** 46/50 runnable passed (92.0%). Raw: pass=46 fail=2 skip=0 timeout=2 total=50.
+**Total:** 84/99 runnable passed (84.8%). Raw: pass=84 fail=12 skip=1 timeout=3 total=100.
 
 ## Top failure modes
 
-- **2x** Timeout
-- **2x** Test262Error (assertion failed)
+- **10x** Test262Error (assertion failed)
+- **3x** Timeout
+- **1x** ReferenceError (undefined symbol)
+- **1x** SyntaxError (parse/unsupported syntax)
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/Number | 46 | 2 | 0 | 2 | 50 | 92.0% |
+| built-ins/String | 84 | 12 | 1 | 3 | 100 | 84.8% |
 
 ## Per-category top failures (min 10 runnable, worst first)
 
-### built-ins/Number  (46/50 — 92.0%)
+### built-ins/String  (84/99 — 84.8%)
 
-- **2x** Timeout
-- **2x** Test262Error (assertion failed)
+- **10x** Test262Error (assertion failed)
+- **3x** Timeout
+- **1x** ReferenceError (undefined symbol)
+- **1x** SyntaxError (parse/unsupported syntax)

plans/js-on-sx.md

@@ -158,6 +158,8 @@ Each item: implement → tests → update progress. Mark `[x]` when tests green.
 
 Append-only record of completed iterations. Loop writes one line per iteration: date, what was done, test count delta.
 
+- 2026-05-08 — **Native prototypes carry the wrapped primitive marker.** Per ES, `Boolean.prototype` is a Boolean wrapper around `false`, `Number.prototype` wraps `0`, `String.prototype` wraps `""`. So `Boolean.prototype == false` (loose-eq unwraps), `Object.prototype.toString.call(Number.prototype) === "[object Number]"`, etc. Set `__js_boolean_value__: false` / `__js_number_value__: 0` / `__js_string_value__: ""` on the respective prototypes in the post-init block. built-ins/Boolean: 23/27 → 24/27, String: 80/99 → 84/99. conformance.sh: 148/148.
+
 - 2026-05-08 — **`js-to-number` throws TypeError when valueOf+toString both return non-primitive.** Mirrors the earlier `js-to-string` fix. Per spec, `Number(obj)` must throw if `ToPrimitive` cannot extract a primitive. Was returning `NaN` silently. Replaced the inner `(js-nan-value)` fallback with `(raise (js-new-call TypeError ...))`. built-ins/Number: 45/50 → 46/50. conformance.sh: 148/148.
 
 - 2026-05-08 — **`Array.prototype` / `Number.prototype` / etc. inherit from `Object.prototype`.** Per ES, every native prototype's `[[Prototype]]` is `Object.prototype` (and `Function.prototype.[[Prototype]]` is also `Object.prototype`). Was missing those `__proto__` links, so `Object.prototype.isPrototypeOf(Boolean.prototype)` returned false (the explicit isPrototypeOf walks `__proto__`, not the recent fallback). Added 5 `dict-set!` lines to the post-init block at the end of `runtime.sx`. built-ins/Boolean: 22/27 → 23/27, built-ins/Number: 44/50 → 45/50. conformance.sh: 148/148.