[Webkit-unassigned] [Bug 197362] New: SameValueZero implementation bug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197362

            Bug ID: 197362
           Summary: SameValueZero implementation bug
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: me at nuragic.io

Given this code:

`const uniqueSet = new Set([NaN, 0/0])`

The content of `uniqueSet` is:

`Set {NaN, NaN} (2)`


This behaviour violates the step 2.a. of the SameValueZero spec which states:

> "If x is NaN and y is NaN, return true."

https://www.ecma-international.org/ecma-262/#sec-samevaluezero

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