Cast both sides of flag filter to uint64

[ld-cd]

This is not strictly safe if we have 64 flags,

A correct fix would be to identify why the self._flagArray Field is an int64 and not a uint64, and why sometimes the flags we want to filter int64 flags and address this issue

Closes #127

[codecov[bot]]

Codecov Report

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

Project coverage is 19.81%. Comparing base (ed1a59e) to head (bb84ad4). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #128 +/- ## ======================================= Coverage 19.81% 19.81% ======================================= Files 26 26 Lines 7579 7579 ======================================= Hits 1502 1502 Misses 6077 6077 ```

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