I see the active review dates of May 10 to 17, but I don’t see any messages 
about it on here.

If comments are welcome at this time, read on.   If not, please remind me what 
the process is (and maybe read on anyway?)!

Interoperation:
  If I have an existing ObjC (or just C) code baae that uses 
dispatch_get_specific, how does it interoperate with Swift code and 
DispatchSpecificKey<T>?   How do I annotate my void* keys to bridge them into 
Swift?  (I don’t know of any library that used dispatch keys in API, but I do 
know of plenty that use them internally and it would hinder Swift migration to 
have an all-or-nothing migration here!)


Apparently Incomplete (perfectly understandable if I’m jumping the gun and 
commenting early):

DispatchGroup:
  I can see it has been renamed, and what the equivalent of 
dispatch_group_async is, but I don’t see dispatch_group_wait or 
dispatch_group_notify’s new names anywhere.

DispatchSemaphore:
  Again I see the new name, but I don’t see 

Bikeshed:
  queue.asynchronously(…) oh dear god so much typing…um, I mean, er, “async is 
a term of art, and perfectly appropriate here”
  queue.synchronously(…) yeah, that is a lot of letters…and “sync” is a 
perfectly fine term of art, can we use it?

Color Me Impressed:
  “ all without adding runtime overhead” and we have the 
DispatchQueue.asynchronously taking 3 arguments with default values.   Can the 
Swift compiler really turn a call with all the arguments in the default state 
into a dispatch_async call without runtime overhead of checking for 
nil/.unspecified, and []?  (not “can” = “sure, someday”, but “yeah, it does 
that sort of thing, maybe even here”)

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