a feature request / wish to have such rounding option with an alternative syntax:
```
round (2/3) // 1
round [2/3, 0] // 1 - same as round (2/3)
round [2/3, 1] // 0.7
round [2/3, 2] // 0.67
round [2/3, 3] // 0.667
// etc - up to float precision of course.
// negative values (e.g round [2/3, -3]) = ? round to the above?
round [6, -2] // 10?
round [1438, -4] // 1000?
```