cache values and errors, not futures#81

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craig-day wants to merge 2 commits intographql-java:masterfrom

craig-day:craig-day/cache-values-not-futures

Commits on May 5, 2021

cache values and errors, not futures
craig-day
committed

Commits on May 6, 2021

drop setIfAbsent to stay close to reference; update docs; helper fn
craig-day
committed