[Webkit-unassigned] [Bug 228064] New: JS binary addition operator does not conform to spec

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228064

            Bug ID: 228064
           Summary: JS binary addition operator does not conform to spec
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jules.bertholet at gmail.com

WebKit Version       : WebKitGTK 2.32.2
Other browsers tested:
    Firefox: 89.0.2: OK
    V8 (Chromium/NodeJS/Deno): Same issue

What steps will reproduce the problem?
(1) Evaluate the JavaScript expression "{} + {}"

What is the expected result?
The numeric value "NaN" is returned, as per the spec (https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#sec-applystringornumericbinaryoperator).

What happens instead?
The string '[object Object][object Object]' is returned.

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