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Some Git merge drivers can partially resolve conflicts, leaving some conflict markers in the output file. In that case, they exit with a code between 1 and 127 to indicate that there was a conflict remaining in the file (since Git uses a shell to run the merge drivers, and shells often use exit codes above 127 for special meanings such as exiting due to a signal): https://git-scm.com/docs/gitattributes#_defining_a_custom_merge_driver We should support this convention as well, since it will allow many Git merge drivers to be used with Jujutsu, but we don't run our merge tools through a shell, so there is no reason to treat exit codes 1 through 127 specially. Instead, we let the user specify which exact exit codes should indicate conflicts. This is also better for cross-platform support, since Windows may use different exit codes than Linux for instance.