Known and fixed defect:
1213. [bug] fdupont
Option string values containing comma can now be specified
correctly by preceding comma with double backslashes (e.g.
"foo\\,bar").
(Trac #5105, git fa79ac2396aa94d7bac91bd12d3593ebaaa9386d)
Regards
Francis Dupont <fdupont at isc.org>