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The year is 2022; I would hope that these are defined by now in all of our supported platforms. I think it's already the case that we have required a newer
lib
anyway via #49623 usingcopyWithin
, and nobody's complained yet.This removes the shims project and makes us throw if we can't find
Map
orSet
.It'd ultimately be nice to be able to just use the "real"
Map
andSet
, but this is a good step.