Replace integer division by floating division in `Float` hyperparameter

[sfo]

This fixes #1001

I omitted explicitly calling math.floor(), since the result gets cast to int anyway.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.37%. Comparing base (8aa8dc2) to head (6c36aba).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1002 +/- ## ======================================= Coverage 98.37% 98.37% ======================================= Files 50 50 Lines 3085 3085 ======================================= Hits 3035 3035 Misses 50 50 ```

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