clean up multipart and field stream trait impl #2462
Merged
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PR Type
Refactor
PR Checklist
Overview
Remove unnecessary indirection of
InnerMultipart
.Multipart
is notClone
so there is no concurrent access to it in any form.Reduce branches in
<Multipart as Stream>::poll_next
and<Field as Stream>::poll_next
by always check happy path first and only check safety once per poll.