interned Strings, or both.
I may rework this into attributes that can be specified for any
@Transformer annotation, and leave it up to each Transformer
whether they are honored (and how).
to FindAllQuery.
- We don't need to destructively modify the Set of keys to fetch if we hold
on to one iterator.
- We can create an ArrayList that won't need to grow if our keys Iterable
happens to be a Collection.
- And, just generally prefer Lists factories to specific constructors.