[BUG] Equality check does not support integers

[muendlein]

The existing equality check does not support integers as np.allclose will throw an exception:

xfin = isfinite(x)
TypeError: ufunc 'isfinite' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

def default_equality_check(a, b):
    if isinstance(a, str):
        return a == b

    return np.allclose(a, b)