Accept JS::Object like object in JS::Object#==

Fixes #395

Author: kateinoigakukun

packages/gems/js/ext/js/js-core.c

@@ -240,8 +240,14 @@ static VALUE _rb_js_obj_strictly_eql(VALUE obj, VALUE other) {
  * Performs "==" comparison, a.k.a the "Abstract Equality Comparison"
  * algorithm defined in the ECMAScript.
  * https://262.ecma-international.org/11.0/#sec-abstract-equality-comparison
+ * If the given other object is not a JS::Object, try to convert it to a
+ * JS::Object using JS.try_convert. If the conversion fails, returns false.
  */
 static VALUE _rb_js_obj_eql(VALUE obj, VALUE other) {
+  other = _rb_js_try_convert(rb_mJS, other);
+  if (other == Qnil) {
+    return Qfalse;
+  }
   struct jsvalue *lhs = check_jsvalue(obj);
   struct jsvalue *rhs = check_jsvalue(other);
   bool result = rb_js_abi_host_js_value_equal(lhs->abi, rhs->abi);

packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb

@@ -31,6 +31,13 @@ def test_eql?
 
     assert_object_eql? false, JS.eval("return 24;"), JS.eval("return 42;")
     assert_object_eql? false, JS.eval("return NaN;"), JS.eval("return NaN;")
+
+    # Compare with JS::Object like object
+    assert_equal true, JS.eval("return 42;") == 42
+    assert_equal true, JS.eval("return 42;").eql?(42)
+    assert_equal false, JS.eval("return 42;") != 42
+    # Compare with non JS::Object like object
+    assert_equal false, JS.eval("return 42;") != Object.new
   end
 
   def assert_object_strictly_eql?(result, a, b)