Code cleanup#100

Merged

zonyitoo merged 1 commit intomongodb:masterfrom H2CO3:grand-cleanup

Jul 27, 2018

+138-141

Commits on Jul 27, 2018

Code cleanup: remove several unnecessary allocations (clone()/to_owned()/to_string()) and ref-deref noops for Copy types; #[derive] some useful std traits for certain types for better int…
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