Function constants for Identity and No-op

[Andy Earnshaw]

On Wed, 10 Aug 2016 at 12:42 Michał Wadas <michalwadas at gmail.com> wrote:

> Function.prototype is no-op (run Function.prototype.toString() for more
> information)
>

That's true, but using `Function.prototype` can be confusing when passed to
a function as a callback:

    someFunc(Function.prototype);

It's not immediately clear that `someFunc` is expecting a callback function
in this case, whereas `Function.NOOP` or `() => {}` are pretty obvious.
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