def _env_to_bool(val):
    """
    Convert *val* to a bool if it's not a bool in the first place.
    """
    if isinstance(val, bool):
        return val
    val = val.strip().lower()
    if val in ("1", "true", "yes"):
        return True

    return False
Convert *val* to a bool if it's not a bool in the first place.