rather than wasting time on the early part of an import
before the unsupported command is detected.
+notes::
+ Require that the backend support the 'notemodify' (N)
+ subcommand to the 'commit' command.
+ Versions of fast-import not supporting notes will exit
+ with a message indicating so.
+
+
`option`
~~~~~~~~
Processes the specified option so that git fast-import behaves in a