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 :white_check_mark:

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

```diff @@ 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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