from typing import Any


def validate_boolean(var: Any) -> bool:
    """Evaluates whether an argument is boolean True/False

    Args:
        var: the input argument to validate

    Returns:
        var: the value if it passes validation

    Raises:
        AssertionError: `var` was not boolean
    """
    assert isinstance(var, bool), "Argument must be True/False"
    return var