Use schnellru crate instead of lru in massa-protocol-worker #3974
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Closes #3844
Uses
schnellru
version0.2.1
for the Lru cache in protocol worker.Some hacks were required to make it work as it doesn't have any
contains
,iter_mut
andpromote
functions.Also, some other functions have different behavior (
get
returns a&mut
to have a immutable we have to usepeek
)