[Webkit-unassigned] [Bug 147268] New: Avoid 2 times name iteration in Object.assign

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147268

            Bug ID: 147268
           Summary: Avoid 2 times name iteration in Object.assign
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

Object.assign calls Object.getOwnPropertyNames & Object.getOwnPropertySymbols to collect all the names.
But exposing the private API that collects both at the same time makes the API efficient when the given Object has so many non-indexed properties.
Since Object.assign is so generic API (some form of utility API), the form of the given Object is not expected.
This is why I think this optimization is required.

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