This was asked/answered indirectly in this thread I think, but having
hard time finding it (might have been a different thread).

If logic is to progress through 20 entities serially which is better
now regarding costs:

a) fetch(20) in  a query, then do "for result in results:"

or

b) query the keys, then iteratively get() the 20 entities by key_id

or

c) query the keys, then do a batch get() using the keys

Pretty sure (a) is not it, but uncertain about (b/c). Appreciate it,
stevep

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