Small Proposal "!in"

[T.J. Crowder]

On Tue, Jul 24, 2018 at 12:28 AM, Steve Fink
<sphink at gmail.com> wrote:
> Or perhaps `in.own` should be Object.prototype.hasOwnProperty.call(obj,
> prop)?

It should just use the abstract [HasOwnProperty][1] operation directly.

-- T.J. Crowder

[1]: https://tc39.github.io/ecma262/#sec-hasownproperty
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