repository changed while pushing - please try again

Sat Oct 8 13:36:53 UTC 2016

Hi!

Sometimes while pushing to the Hg repository I get an error:

> abort: push failed:
> 'repository changed while pushing - please try again'

It's quite surprising for me that I can't push simultaneously to different
branches - as I see in the source code this error occurs when any(!) head
is changed while another push is in progress. It looks like a serious
design flow - can you explain, please, why is it happening and what is a
reason for such design? - May be I missed something.

Also, I found that if I force-push ('-f' argument) then no errors occur. Is
it a good solution to always force-push when I know that _almost_ all
simultaneous pushes go to different heads?

Thanks in advance!

Best regards, Ivan
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