"reduce" callback gets incorrect index

[vitaly-t]

import {pipe, reduce} from 'iter-ops';

const input = [3, 0, -2, 5, 9, 4];

const i = pipe(input, reduce((prev, curr, idx, state) => {
    console.log(idx);
    return prev;
}));

const r = [...i];

Expected Output:
1 2 3 4 5

Actual Output
2 4 6 8 10

As a test against the standard reduce...

• without initial value:

input.reduce((prev, curr, idx)=>{
    console.log(idx);
    return prev;
});

Outputs: 1 2 3 4 5

• with initial value:

input.reduce((prev, curr, idx)=>{
    console.log(idx);
    return prev;
}, 0);

Outputs: 0 1 2 3 4 5

[vitaly-t]

This issue was fixed and released in v2.1.1