scaleComputeY may return an array, when integer is required

[szymach]

There are multiple places when the result of scaleComputeY is used as parameters of function, that expect integers. This may yield unexpected results or errors.

[bozhinov]

in my branch I solved it by separating the functions for single input and for array
in that way I was able to verify both input and output

[szymach]

So you would change the interface of classes. This would require me to start a new version, 4.x, that would not provide 100% BC, but I think it can do that leap. Let us push as many of your non-BC breaking fixes to the current master branch, then I will make a 3.x branch out of it and we can start doing things that will break BC.

[bozhinov]

scaleComputeY is an internal function. changing it would not break compatibility