I'd prefer to not have them loaded at all (maybe with log.warning)
than to have them loaded with a known-to-be-incorrect type.
If you really don't want to manipulate them from Python, not loading
them is the Right Thing. If you do want to manipulate them then the
Right Thing is to add the
OK, i propose we make the KeyError more friendly, and add an option
skip_unknown_types to Table to indicate just to skip the columns. if
we really want the default fallback type, id prefer an option for
that too, like default_type=sometype and it will shove that type in
for the unknown
