1654075 - Add `Iterator.prototype[Symbol.toStringTag]` and `AsyncIterator.prototype[Symbol.toStringTag]`

Status: RESOLVED MOVED

(Core :: JavaScript Engine, enhancement)

Description

[ExE Boss]

Bug 1644581 seems to indicate that the reason why the %Symbol.toStringTag% property on %Iterator.prototype% broke web compatibility was that it was added as non‑writable.

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There also wasn’t any attempt to add the %Symbol.toStringTag% property to %AsyncIterator.prototype%, which seems more likely to succeed, given that it’s a much more recent addition to ECMAScript.

Comment 1

[Tom S [:evilpie]]

All other @@toStringTag properties are non-writable, so I am not sure if we really should derivative here. Not sure what the trade-offs are between writable and not defining it at all.

This should be discussed on the tc39 github so other people can find this more easily.

Comment 2

[Jason Orendorff [:jorendorff]]

We will not be implementing this until there's evidence that it's web-compatible; let's continue the discussion in proposal issue #115.