Fix small documentation inconsistency
Merge pull request #251 from amiel/rsvp-docs-fix

Fix small documentation inconsistency
PromiseEnumerator:

- encapsulates the majority of all/allSettled/hash/hasSettled logic
- prevents some recent performance tuning from exploding the file size
- enables all enumerable methods to share in the perts
[Bugfix] race should not be susceptible to zalgo
Merge pull request #249 from stefanpenner/perfs

WIP Perfs
instrumentation should emit out-of-band

cc (@teddyzeenny)
promise is already sealed, don’t bother proceeding.
although uncommon, denodeify should work in older browsers.
add JSON2
compatibility fixes