The FileMapper has a different behaviour regarding parameters in versions 3.0.0 to 3.0.2:

3.0.2: https://github.com/utPLSQL/utPLSQL/blob/v3.0.2/source/core/ut_file_mapper.pkb#L69
3.0.3: https://github.com/utPLSQL/utPLSQL/blob/v3.0.3/source/core/ut_file_mapper.pkb#L75

So with the current calling, versions 3.0.0 to 3.0.2 will not get default TypeMapping when no explicit mapping is passed.

This can be solved by introducing a Compatiblity-Version of FileMapper similar to the one we have for TestRunnerStatement. For 3.0.0 to 3.0.2 we should not pass arguments that are NULL or empty (in respect of utPLSQL/utPLSQL-cli#162).
From 3.0.3 on we can stay with the current approach of passing all parameters.