mustn't is ambiguous. It may mean "you don't need to" even when it's not a tag question. See prose:
http://books.google.cz/books?id=otFPvwLG524C&pg=PA241&lpg=PA241&dq=mustn%27t+trouble+yourself&source=bl&ots=vjgh7n-yyW&sig=LBQAwlZu3GxI5YzvRAXFow4hE1U&hl=en&sa=X&ei=a14XU9vxB4SBywOPz4HwDw&ved=0CDQQ6AEwAg#v=onepage&q=mustn%27t%20trouble%20yourself&f=false
http://www.nytimes.com/books/first/m/maynard-home.html (search for mustn't)
We mustn't argue over grammar.
See: https://github.com/dotcloud/docker/pull/4473
Docker-DCO-1.1-Signed-off-by: Timothy Hobbs <timothyhobbs@seznam.cz> (github: timthelion)
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@@ -88,7 +88,7 @@ curl -o .git/hooks/pre-commit https://raw.github.com/edsrzf/gofmt-git-hook/maste |
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Pull requests descriptions should be as clear as possible and include a |
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reference to all the issues that they address. |
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-Pull requests mustn't contain commits from other users or branches. |
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+Pull requests must not contain commits from other users or branches. |
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Code review comments may be added to your pull request. Discuss, then make the |
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suggested modifications and push additional commits to your feature branch. Be |