This capability can be advertised multiple times. The first
applicable refspec takes precedence. The left-hand of refspecs
advertised with this capability must cover all refs reported by
-the list command. If no 'refspec' capability is advertised,
-there is an implied `refspec *:*`.
+the list command. If a helper does not need a specific 'refspec'
+capability then it should advertise `refspec *:*`.
'bidi-import'::
This modifies the 'import' capability.