🐛 bug: i. sequences should start from zero
#3
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this fixes a small bug for the `i.` operator, which was generating
sequences `1..n`, rather than `0..n-1`.
comparing with the official J runtime for reference:
```
; jconsole
i. 0
i. 5
0 1 2 3 4
i. 5 5
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
; cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.10s
Running `target/debug/j`
i. 0
i. 5
0 1 2 3 4
i. 5 5
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
```
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this fixes a small bug for the
i.operator, which was generating sequences1..n, rather than0..n-1.comparing with the official J runtime for reference: