[Webkit-unassigned] [Bug 205772] New: Proxy's [[OwnPropertyKeys]] is correct only in PropertyNameMode::StringsAndSymbols

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205772

            Bug ID: 205772
           Summary: Proxy's [[OwnPropertyKeys]] is correct only in
                    PropertyNameMode::StringsAndSymbols
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

ECMA262: https://tc39.es/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys (step 11)

1. If Object.getOwnPropertyNames is called on Proxy with "ownKeys" trap, symbol keys of Proxy's target are ignored during invariants validation.

Test262:
  https://test262.report/browse/built-ins/Object/getOwnPropertyNames/proxy-invariant-absent-not-configurable-symbol-key.js
  https://test262.report/browse/built-ins/Object/getOwnPropertyNames/proxy-invariant-not-extensible-absent-symbol-key.js
  https://test262.report/browse/built-ins/Object/getOwnPropertyNames/proxy-invariant-not-extensible-extra-symbol-key.js

2. If Object.getOwnPropertySymbols is called on Proxy with "ownKeys" trap, string keys of Proxy's target are ignored during invariants validation.

Test262:
  https://test262.report/browse/built-ins/Object/getOwnPropertySymbols/proxy-invariant-absent-not-configurable-string-key.js
  https://test262.report/browse/built-ins/Object/getOwnPropertySymbols/proxy-invariant-not-extensible-absent-string-key.js
  https://test262.report/browse/built-ins/Object/getOwnPropertySymbols/proxy-invariant-not-extensible-extra-string-key.js

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