use hashbrown as internal hashmap #146
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hashbrown is the same hashmap used by the std library. however the std library uses some safer defaults (denial-of-service resistant hashing) and is a few versions behind.
these differences may lead to performance loss when not required.
using hashbrown in BNF improved all benchmarks on my local machine by 2-25%.
for this reason, it seems worth BNF adopting hashbrown as its default hasher.
the denial-of-service resistance is not required for BNF's use cases