Do not dump TSI1 tables that only contain OFFSETs that match the actual composite metrics?

[madig]

The TSI1 table is full of composite glyph entries that are essentially OFFSETs that match the sub-glyph offsets. Is there any point in dumping them to the UFO?

[anthrotype]

the point was that the TTX dumps of the TSI* tables, which are stored in the UFO's data folder, can be easily dumped and merged like regular TTX files (i.e. independently of vttLib), and are therefore complete.
Those OFFSET instructions (which can be seen as redundant in the UFO) are necessary inside the VTT application; if missing, a composite glyph will no longer reference that component (the glyf table itself would be modified) after compiling the hinting from inside VTT.