feat(metadata): remove manual Send + Sync
impls for metadata types
#640
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Removes manual
Send
andSync
impls for these types as they weren'tnecessary:
metadata::Iter
metadata::IterMut
metadata::ValueDrain
metadata::ValueIterMut
Since all the types they contained were
Send + Sync
we can rely on thecompiler automatically adding the impls.
Also added some tests to ensure we don't accidentally make them
!Send
or
!Sync
in the future.Fixes #636