Add splicing iterators #294
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`IndexMap::splice` and `IndexSet::splice` will drain the specified range, and then insert items from an iterator to replace that range. This is like `Vec::splice`, except if any new keys match the retained entries outside the range, then those keep their relative position.
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It might be possible to optimize this with some |
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IndexMap::spliceandIndexSet::splicewill drain the specifiedrange, and then insert items from an iterator to replace that range.
This is like
Vec::splice, except if any new keys match the retainedentries outside the range, then those keep their relative position.
Resolves #274.