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The confusion comes from the fact that set() automatically coerces space-delimited items into a ;-delimited list
set(ONE alpha;beta)
set(TWO alpha beta)
list(LENGTH ONE one_len)
list(LENGTH TWO two_len)
message(FATAL_ERROR "one <<${ONE}>> length ${one_len}\ntwo <<${TWO}>> length ${two_len}")
emits one <<alpha;beta>> length 2
two <<alpha;beta>> length 2
1: https://www.youtube.com/watch?v=CUleKnUUaGI&lc=Ugyty4kLtMj52...