[Webkit-unassigned] [Bug 199138] New: Object.prototype.toString is not spec-perfect

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sun Jun 23 15:37:58 PDT 2019


            Bug ID: 199138
           Summary: Object.prototype.toString is not spec-perfect
           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-object.prototype.tostring
Test262: https://test262.report/browse/built-ins/Object/prototype/toString/proxy-function.js

1. Proxied functions:

toString.call(new Proxy(function() {}, {}))
// actual: "[object Object]"
// expected: "[object Function]"

2. Proxy constructor:

// actual: "[object Proxy]"
// expected: "[object Function]"

3. Post ES5 built-ins and DOM objects with deleted @@toStringTag are treated specially:

Test262: https://github.com/tc39/test262/pull/2202

delete Math[Symbol.toStringTag]
// actual: "[object Math]"
// expected: "[object Object]"

4. @@toStringTag symbols are missing on WebAssembly API and DOM objects:

// actual: undefined
// expected: "HTMLDocument"

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