Support hash size that's not std::size_t

[alex-sparus]

TODO:

• Make a test with WASM and try to read a map from JSON

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.54%. Comparing base (395f288) to head (48d559a).
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
- Coverage   90.54%   90.54%   -0.01%     
==========================================
  Files         121      121              
  Lines       12220    12219       -1     
==========================================
- Hits        11065    11064       -1     
  Misses       1155     1155              

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[arximboldi]

LGTM!