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grandpa: reduce allocations when verifying multiple messages #4693
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GRANDPA messages are localized when encoded, to include the round and set id they refer to. This means that given a message and a signature there's an extra step of intermediary encoding needed to do the verification. This PR re-uses the buffer used for encoding when verifying multiple messages at once (i.e. commits, catch-up requests and justifications).
@arkpar reported that checking of compact commits was showing up on the profiler as performing a lot of allocations.