2.0 upgrade experiences

[Aaron Bentley]

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Robert Collins wrote:
>> In other words the user problem is not so much "help I'm out of disk"
>> but "I thought this would shrink it but it grew, wtf?"
> 
> One thing we could do is delete the pack command.

Or just rename it to something less enticing, like "combine-packs".

Pack *will* produce a single pack that is less than the sum of its
components, so the "reduce size" connotation isn't completely wrong.

Ideally, we shouldn't need it, but we've needed it recently-enough that
I am uncomfortable removing it entirely.  Maybe farm it out to a plugin?

Anyhow, I think it's really the upgrade command we need to worry about.

Aaron
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