David H Park

Filtering for '_' using the 'contains' operator does not work: ``` In [50]: [q['amino_acid_change'] for q in query.filter(amino_acid_change__contains='_')] Out[50]: [] ``` However, filtering for '_' does work using the 'regexp'...

## Add BitFlip Environment to PufferLib BitFlip is a simple 1D game where the goal is to match the current state to a target pattern by flipping the necessary bits....