+--missing::
+ Allow missing objects. The default behaviour (without this option)
+ is to verify that each tree entry's sha1 identifies an existing
+ object. This option has no effect on the treatment of gitlink entries
+ (aka "submodules") which are always allowed to be missing.
+
+--batch::
+ Allow building of more than one tree object before exiting. Each
+ tree is separated by as single blank line. The final new-line is
+ optional. Note - if the '-z' option is used, lines are terminated
+ with NUL.
+