Follow-up Comment #1, patch #5964 (project freeciv):
I've now looked this a bit, but the end result so far is that I fail to see
why it would be needed (why was "riveroverlay" ever needed?).
It would act like a mask to extras (specials in case of "riveroverlay") so
that all the other extras from the savegame are ignored. But why would any
ruleset author include, in the first place, any extras that (s)he then wants
to get filtered out. Why would one want "1 & 0 -> 0" rather than just "0 ->
0"?
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