Font sizes can be a float number when the docx document was created in google docs. We can do a bit of a simplification and truncate them to int but the string conversion needs to be to a float.

There can be a case where the grid_span values don't match exactly with the offsets and an element may span beyond the remaining_offset. Case that prompted this discovery had grid_offset=0 and a single tc element with tc.grid_span=9.