[RFC] Warn when doing slow pull/push because of difference in formats?

[Jelmer Vernooij]

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I've come across some situations where people who often push to a
different bzr repository format or pull into a different repository
format than their upstream branch (e.g. knits to pack-0.92 or
1.9-rich-root to development6). Since this means a conversion has to
be done such pulls/pushes are a lot slower than they would be if the
two repositories would be in the same format. This incorrectly gives
users the impression that bzr is slow; they just happen to be
exercising a slow code path in bzr.

Perhaps some of the more expensive InterRepository implementations can
warn the user that they're doing a slower push/pull ?

Cheers,

Jelmer
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