[Webkit-unassigned] [Bug 210267] New: ProxyObject::defineOwnProperty() should conditionally throw on falsy trap result

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210267

            Bug ID: 210267
           Summary: ProxyObject::defineOwnProperty() should conditionally
                    throw on falsy trap result
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Trivial
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

Test case:
  Object.defineProperty(new Proxy({}, {defineProperty: () => false}), "foo", {})

Expected:
  TypeError thrown

Actual:
  Proxy object returned

ECMA262: https://tc39.es/ecma262/#sec-object.defineproperty (step 4)
Test262: https://test262.report/browse/built-ins/Proxy/defineProperty/trap-is-undefined-target-is-proxy.js

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