Please provide documentation for the DiffType enum in boomerang

I need three sentences how to interpret the boomerang output(s) and in particular, a sentence on

1. What are the [diff types](https://github.com/INCATools/ontology-access-kit/blob/fc3c906f60e0bbbef2281f0122d6bbbe6ba0e51a/src/oaklib/utilities/mapping/boomer_utils.py#L37)
2. What should be the action as a consequence of encountering one of these values in a row? Say I encounter "conflict", or "ambiguous" -> what does that tell me? What should the curator do in response to these?