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Absolute value
Returns the absolute value of a numeral or temporal, returns null for null.
Syntax: abs x; abs[x]
o)abs 1.0 -10.5 0
1 10.5 0
o)abs 0N
0N
abs
is fully atomic:
o)abs (1;-2 3;-4 5 6.0)
1
2 3
4 5 6f