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Add methods
find_or_insert
,find_or_insert_with
,insert_or_update_with
andreserve_at_least
to theMutableMap
trait.Closes #5568.
The unsafe way of implementing
find_or_insert_with
onTreeMap
mentioned in the issue discussion doesn't work after all. The way done here isn't great but it works at least. Someone can come up with a better implementation in the future but I don't think that should hold the rest of this up.