Add -m for commit and deprecate -t
Index: hg/doc/hg.1.txt
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+ hg init
+ echo This is file a1
+ hg add a
+ hg commit -t 'commit #0' -d '0 0' -u user
+ touch b
+ hg add b
+ rm b
+ hg commit -A '-tcomment #1' -d '0 0' -u user
b never committed!