* Fixes#2445 and fixes#2446.
* Fixed shadow refiner.
— The script uses the values of the array instead of the indexes to loop through it.
* Fixed segfault in getequiprefinecost.
— No checks in getequiprefinecost meant there were possibilities using negative indexes in arrays.
* Added to the script documentation what happens on failure when calling getequiprefinecost (it returns -1).
Thanks to @vstmpf, @crazystorm2017, and @hendra814!
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