perf: use map for the in-memory store #353
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Reference: kibertoad/toad-cache#40
Benchmark: kibertoad/nodejs-benchmark-tournament#12
TLDR, I've discovered a 50%+ improvement in the lookup performance of non-numeric keys when a map is used instead of an object
In
rate-limit, the key of a request is by default its IP address, so we should benefit directly from the change