push when nothing changed

[Alexander Belchenko]

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I do successful push over sftp.
Then I push second time (branch not changed!).
bzr read about 1Mbyte data over sftp to detect that nothing need to push.
Is it intended behaviour?

For me it's very unpleased because it takes several minutes over my
not-so-fast connection.

IIUC, bzr pull read from remote location only branch-history to detect
that nothing changed. What push do? And why?

Alexander
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