fix behavior + test #55
Merged
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This fixes the edge case where it was possible to have duplicate
obs_typecolumns in the return object fromparse_input_data().It's still a bit ugly to have a specific line of code to set OBS_TYPE to NULL to avoid an edge case, but I think this is the simplest solution. The other solution is to not care about the edge case (it essentially only occurs with erroneous usage).
Very minor change, shouldn't affect any production code.