Array#flat is coming to ES; would you like like some sugar with that?

[Michael Luder-Rosefield]

Apologies 'if' this is a terrible idea, but since I have just encountered a
situation where this sugar would actually be useful I'm absolutely going to
suggest it.

Extend the ... syntax to allow for flattening deconstructed arrays.
_Literally_ extend it:

....array === ...(array.flat()) // i.e. depth 1
.....array === ...(array.flat(0)) // unlimited depth
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