avoiding the time it takes to start the Python interpreter and load all the
+* Interactive commands, like `hg record` and `hg commit` with no args (usually
+ opens an editor) are borked.
+* Output isn't shown until the command is finished. That means you don't get
+ incremental notifications from `hg push`, etc.
+* Arguments (like `-m` for `hg commit`) cannot contain newlines.
+* Color is always enabled. Not suitable for scripting.
+* Standard error is combined with standard output. Not suitable for scripting.
+* It will probably eat your data.