[luatex] Why is --progname needed?

Karl Berry karl at freefriends.org
Sun Apr 19 01:20:46 CEST 2009

    > This is LuaTeX, Version snapshot-0.39.0-2009041812 luatex.web v2306

Since 2306 doesn't tell the whole story, is it useful in practice?
Taco?  It seems like the timestamp is the most useful version

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