def METHOD_NAME(user_set_biases: Optional[List[ActivatableBias]]) -> List[ActivatableBias]:
    if user_set_biases is None:
        return DEFAULT_BIASES
    id_to_user_bias = {bias["id"]: bias for bias in user_set_biases}
    returned_biases = []
    for bias in DEFAULT_BIASES:
        if bias["id"] in id_to_user_bias:
            returned_biases.append(id_to_user_bias[bias["id"]])
        else:
            returned_biases.append(bias)
    return returned_biases