[MERGE][0.19] change the pack interface to use tuples for names

[Aaron Bentley]

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John Arbash Meinel wrote:
> John Arbash Meinel has voted approve.
> Status is now: Approved
> Comment:
> Is this okay for 0.19? Since the wire format is the same, it seems
> reasonably safe whenever. Though I would hate to have to worry about
> function compatibility (since you need a bunch of new functions for the
> tuple versions, and you have to deprecate all of the single string
> versions)

I think the intent is fine.  I haven't read the code carefully.  It's
the sort of API break I can live with, even though the single-string API
was released as part of 0.18.

Aaron
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