Consider making `$`-prefixed getters `SameValue` with the equivalent non‑`$` getters

[ExE-Boss]

Currently, the following all log false in Firefox and the spec:

const $gOPD = Object.getOwnPropertyDescriptor;

$gOPD(RegExp, "$_").get === $gOPD(RegExp, "input").get;
$gOPD(RegExp, "$&").get === $gOPD(RegExp, "lastMatch").get;
$gOPD(RegExp, "$+").get === $gOPD(RegExp, "lastParen").get;
$gOPD(RegExp, "$`").get === $gOPD(RegExp, "leftContext").get;
$gOPD(RegExp, "$'").get === $gOPD(RegExp, "rightContext").get;

This differs from the following, which all log true:

const $TypedArray = Object.getPrototypeOf(Uint8Array);

Array.prototype.values === Array.prototype[Symbol.iterator];
$TypedArray.prototype.values === $TypedArray.prototype[Symbol.iterator];
Set.prototype.values === Set.prototype[Symbol.iterator];
Map.prototype.entries === Map.prototype[Symbol.iterator];

[claudepache]

Currently, the following all log false in Firefox and the spec:

They log also false in Chrome.

In Safari, the properties are implemented as “magic” value properties, so the argument does not apply.

This differs from the following, which all log true:

You can also add:

Date.prototype.toGMTString === Date.prototype.toUTCString

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Argument for the change:

• consistency with other duplicated properties in ECMA-262.

Argument for status quo:

• 2/3 engines agree with current spec, 0/3 agree with the proposed change;

Note also that this proposal is at stage 3, which means that changes are supposed to be limited.