After initial testing, I already love transactions, started generating some 
gotchas of my own, going to share them when I finish testing/modifications 
(for newbies to transactions like me)

Before going deeper into transactions, I want to ask some questions:

   - Is there a downside of using transactions cost/performance wise? ( 
   retries=10 should potentially 10x increase the cost/performance, but is 
   there anything other than that, something like "transactional costs are 
   reflected as 3x to appengine costs"(made up) etc. -- or any overhead other 
   than retries )
   - Is there any downside of using xg=True ?

Also something like a "dominant transaction" would have been great
For example a pipeline routine could be computing 500 operations at once, 
but a small transaction might take priority and cause the re-computation of 
500 tasks, increasing computation costs / slowing down the pipeline etc.

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