* Flatten object type
* Use separate construct functions
* Use separate gen_*_diff functions
* Remove maptype and seqtype from Diffs
* Preallocate ops in new_map_or_table
* More preallocations
It wasn't really uncompressed as we have compressed and uncompressed
changes in the backend. It is just not encoded into the binary format.
The module separation (protocol vs backend) should help with the
distinction.
