Optimize Vec allocations in map deserialization. #285
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Before:
utils::bench_deserialize_map ... bench: 171.39 ns/iter (+/- 3.53)
utils::bench_deserialize_map_bytes ... bench: 148.27 ns/iter (+/- 3.19)
After:
utils::bench_deserialize_map ... bench: 168.34 ns/iter (+/- 3.19)
utils::bench_deserialize_map_bytes ... bench: 145.40 ns/iter (+/- 1.92)