1 2 3 4 | 0<..<5
0 1 2 3 4 5 | 0=..=5
1 2 3 4 5 | 0<..=5
0 1 2 3 4 | 0=..<5
0 1 2 3 4 | 0..<5
0 1 2 3 4 5 | 0..=5
10@3 20@4 30@5 | xs, 2<..
10@5 20@6 30@7 | xs, 5=..
inline 0<..=3 sum=6
2 3 4 | lo<..=hi
x+2..=42: n=39 sum=897
x+2<..<x*21: n2=37
0..x*3: n3=6
cmp ok
shl=6