[Webkit-unassigned] [Bug 206888] New: [ESNext][BigInt] We don't support BigInt literal as PropertyName

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206888

            Bug ID: 206888
           Summary: [ESNext][BigInt] We don't support BigInt literal as
                    PropertyName
           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: ticaiolima at gmail.com

According to spec, BigInt is a valid PropertyName (https://tc39.es/ecma262/#prod-PropertyName) and it should be evaluated using ToString (https://tc39.es/ecma262/#sec-object-initializer-runtime-semantics-evaluation). Given this, this script should be evaluated without error:

```
// Object Literal

let o = { 1n: "foo" };
assert(a[1n] === "foo");
assert(a[1] === "foo");
assert(a["1"] === "foo");

// MethodDeclaration

o = { 1n() => "bar" };
assert(a[1n]() === "bar");
assert(a[1]() === "bar");
assert(a["1"]() === "bar");

class C {
  1n() { return "baz"; }
}

let c = new C();
assert(c.[1n]() === "baz");
assert(c.[1]() === "baz");
assert(c.["1"] === "baz");

// Destructuring

let {1n: a} = {1n: "foo"};
assert(a === "foo");

```

Original report from https://bugzilla.mozilla.org/show_bug.cgi?id=1605835

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