Ensure that denormalize input is valid.

[neduard]

PR as per #120 (comment)

However, comparing against bound (-1.0 or 1.0) directly might cause problems when x[i] is close to it.
For example, x[i] might be 1.00000000000000001. In that case something like if (x[i] < (-1.0 - EPS) || x[i] > (1.0 + EPS)) might be recommended.

How/where should EPS be defined though?

[darioizzo]

I am hesitant to merge this. I agree with the check, but one should then have a private method denormalize without the check (and called by the obj fun and contraint) and a public method performing the check and then calling the private method. This last would be exposed/offered to the user. Could you implement this?

[krzysztof]

Also, I don't think EPS is necessary here. If you want to make sure that the solution is within box [-1, 1]^n the (x[i] <= -1.0) || (x[i] >= 1.0) is the correct condition.

[krzysztof]

I am closing this for now, feel free to submit new PR or reopen if you're still interested in committing to this! :)