Helper for creating new NumExprFactors.

        This is just a wrapper around NumericalExpression.__new__ that always
        forwards `bool` as the dtype, since Filters can only be of boolean
        dtype.

def create(cls, expr, binds):
        """
        Helper for creating new NumExprFactors.

        This is just a wrapper around NumericalExpression.__new__ that always
        forwards `bool` as the dtype, since Filters can only be of boolean
        dtype.
        """
        return cls(expr=expr, binds=binds, dtype=bool_dtype)