[logback-user] AUDIT Syslog facility problem

Hi, I am trying to use "AUDIT" Syslog facility for logging some stuff but it threw an error saying its not a valid Syslog facility. If I look into ch.qos.logback.core.net.SyslogAppenderBase -> facilityStringToint method, I can see that the configured Syslog facility is not compared with the constant for AUDIT facility. I even checked with the new version 0.9.28 source code, its the same thing. Is this an issue that needs to be fixed in the logback? Thank you, Pradnya