[Webkit-unassigned] [Bug 209571] New: Function.length broken by Object.defineProperty and bind

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209571

            Bug ID: 209571
           Summary: Function.length broken by Object.defineProperty and
                    bind
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andy.niccolai at gmail.com

With the release of Safari 13.1 (and also verified in 13.2 Technical Preview), Function.length always returns zero after binding arguments to a function that has a custom name defined.

Repro JS Fiddle: https://jsfiddle.net/7s9yop23/

Repro code

const originalFn = (a, b) => a + b;
Object.defineProperty(originalFn, 'name', {value: 'newFunctionName'});
const renamedAndBoundFn = originalFn.bind(undefined, 1);

// expected: 1
// actual: 0
renamedAndBoundFn.length

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