Github user SolidWallOfCode commented on the pull request:
https://github.com/apache/trafficserver/pull/206#issuecomment-107638211
The chat concensus seemed to be to change this to NULL, DEFAULT, EXPLICIT,
ENV. I'll change "SRC" to "SOURCE" as well - I was tempted to have "RECS" which
would be more consistent with the other REC values but that seemed even worse
scanning.
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