has anybody ever used 'begin' (i.e. nested database transactions)?
I'd rather doubt it. I used it just once, and only for a short time.
This functionality cannot be implemented in the 64-bit version, because
the low-level representation of external symbols changed. Besides this,
it is rather inefficient and not as useful as I thought.
I want to deprecate it also in the 32-bit version for compatibility
reasons. Any objections?