def METHOD_NAME(
    col_type: ColumnType[MigrationModifiers], modifiers: MigrationModifiers
) -> ColumnType[MigrationModifiers]:
    existing_modifiers = col_type.get_modifiers()
    if existing_modifiers is None:
        return col_type.set_modifiers(modifiers)
    else:
        return col_type.set_modifiers(existing_modifiers.merge(modifiers))