webassembly/objpyproxy: Avoid throwing on symbol or iterator has-check.

WebReflection · dpgeorge · commit e33a0f468237 · 2025-07-04T15:08:03.000+10:00
JavaScript code uses "Symbol in object" to brand check its own proxies, and
such checks should also work on the Python side.

Signed-off-by: Andrea Giammarchi &lt;andrea.giammarchi@gmail.com&gt;
diff --git a/ports/webassembly/objpyproxy.js b/ports/webassembly/objpyproxy.js
@@ -148,6 +148,12 @@ const py_proxy_handler = {
         };
     },
     has(target, prop) {
+        // avoid throwing on `Symbol() in proxy` checks
+        if (typeof prop !== "string") {
+            // returns true only on iterator because other
+            // symbols are not considered in the `get` trap
+            return prop === Symbol.iterator;
+        }
         return Module.ccall(
             "proxy_c_to_js_has_attr",
             "number",
diff --git a/tests/ports/webassembly/py_proxy_has.mjs b/tests/ports/webassembly/py_proxy_has.mjs
@@ -9,3 +9,5 @@ x = []
 const x = mp.globals.get("x");
 console.log("no_exist" in x);
 console.log("sort" in x);
+console.log(Symbol.toStringTag in x);
+console.log(Symbol.iterator in x);
diff --git a/tests/ports/webassembly/py_proxy_has.mjs.exp b/tests/ports/webassembly/py_proxy_has.mjs.exp
@@ -1,2 +1,4 @@
 false
 true
+false
+true

-Original file line number
+Diff line change
@@ @@ -1,2 +1,4 @@ @@
 false
 true
 +false
 +true