Optimize Clone implementation #146
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Update hashbrown to 0.8.1 This update includes: - rust-lang/hashbrown#146, which improves the performance of `Clone` and implements `clone_from`. - rust-lang/hashbrown#159, which reduces the size of `HashMap` by 8 bytes. - rust-lang/hashbrown#162, which avoids creating small 1-element tables. Fixes rust-lang#28481
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Two major changes:
clone_fromis now implemented which can be used to skip memory allocation if the existingHashMapalready has enough capacity.T: Copyinto a simple memory copy.HashMapwhenclone_fromis used. Specialization is needed because theCloneimpl onHashMapis missingK: Hash + Eq, S: BuildHasher.Fixes #112