EnsureDataset cannot handle Path values

[mih]

datalad-gooey does full parameter validation not, and because of that fails on any parameter that has an EnsureDataset constraint, because it does not use string paths internally, but Path objects.

This is a bit ironic, because EnsureDataset does not actually do anything other than rejecting anything that is not a str or Dataset instance.

I will replace this constraint in Gooey with something more useful, because the rational in the code doesnot apply there:

            # we cannot convert to a Dataset class right here
            # - duplicates require_dataset() later on
            # - we need to be able to distinguish between a bound
            #   dataset method call and a standalone call for
            #   relative path argument disambiguation
            #return Dataset(path=value)

Ultimately, datalad-core will need to do something about it, when it would start validating Python command arguments.

datalad/datalad-gooey#298

[yarikoptic-gitmate]

Issue fixed in 0.18.0