[Webkit-unassigned] [Bug 232724] New: Array.prototype.toLocaleString does not stringify undefined/null localization results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232724

            Bug ID: 232724
           Summary: Array.prototype.toLocaleString does not stringify
                    undefined/null localization results
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: richard.gibson at gmail.com

The algorithm at https://tc39.es/ecma402/#sup-array.prototype.tolocalestring requires looking up a "toLocaleString" property on each non-undefined non-null element of the receiver array, invoking it as a method, and (absent an exception) passing the result through ToString. However, JSC appears to bypass ToString for undefined or null output from the toLocaleString method.

The following expression should evaluate to "undefined", but instead evaluates to "":
  [{toLocaleString(){}}].toLocaleString()

The following expression should evaluate to "null", but instead evaluates to "":
  [{toLocaleString(){return null}}].toLocaleString()

Also reported to test262 for coverage: https://github.com/tc39/test262/issues/3298

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