Slava Pestov 3b203a520b Serialization: Don't serialize requirement environment for witnesses ...

Generic environments and archetypes can be expensive to deserialize
if they involve a generic signature not seen before.

Also, canonicalize the witness substitutions to eliminate type
aliases, and map them to interface types, which again are cheaper
to deserialize.

2018-09-27 22:16:17 -07:00

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