use is true for boolify

[adhami3310]

No description provided.

[masenf]

adding this to the integration test_var_operations.py might be helpful if this type of change doesn't trigger a test change, then we must not have good enough coverage

[adhami3310]

I believe you meant test_vars.py (the unit one) and not test_var_operations.py (the integration one, that only tests the output).

But your assumption is correct, there is no tests that match with .bool().