Pyodide workaround due greedy properties access

THe issue is explained in here: pyscript/pyscript#2106

This MR adds reserved workers words to avoid creating forever pending promises all over the place.

The list of words is `__dict__`, `constructor`, `get`, `has`, `includes`, `next`, `set` and `then`.

Author: WebReflection

docs/index.js

@@ -8,7 +8,15 @@ export const workers = new Proxy(new Map, {
   },
 });
 
-export const workersHandler = new Proxy(workers, {
-  get: (_, name) => workers[name].promise.then(w => w.sync),
+// filter out forever pending Promises in Pyodide
+// @issue https://github.com/pyscript/pyscript/issues/2106
+const ignore = new Set(['__dict__', 'constructor', 'get', 'has', 'includes', 'next', 'set', 'then']);
+
+export const workersHandler = new Proxy(Object.freeze({}), {
+  // guard against forever pending Promises in Pyodide
+  // @issue https://github.com/pyscript/pyscript/issues/2106
+  get: (_, name) => (typeof name === 'string' && !ignore.has(name)) ?
+    workers[name].promise.then(w => w.sync) :
+    void 0,
 });
 /* c8 ignore stop */