Yes you are right!
Having an extra parameter on scalarmap is exactly equivalent to adding this parameter onto the front of
the list you pass to reduce.
EG
$z = scalarmap { $a * $b } 1, 2..10;
# is the same as
use List::Util;
$z = reduce { $a * $b } 1, 2..10;
All hail to perl's unfancy list flattening subroutine parameter passing!
This makes scalarmap completely redundant :-( It was fun inventing it though :-)
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