[syslog-ng] Question on '$PRIORITY' and '$LEVEL'

I have a question regarding how syslog-ng treats "priority" and "level" value from the logs. According to RFC, "priority" is different than "level". However, it appears to me that syslog-ng use "level" value for "priority" as well. My questions are: 1. Is that true that syslog-ng use "level" value for "priority" as well? 2. Is there a reason behind this behavior? 3. Is there a plan to change/fix this? Thanks.