Fix wrong interpolation in interpolateArray #4
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Previous implementation didn't interpolate up to the last element in scaleArr, one would expect that interpolateArray([1,2,3,4,5])(1) == 5 but the output was 4, interpolateArray([1,2,3,4,5])(0.5) was 2.5 instead of 3, e.g. it treated the input array as it were one element shorter. This implementation behaves in such a way that interpolateArray([1,2,3,4,5])(1) == 5 interpolateArray([1,2,3,4,5])(0) == 1 interpolateArray([1,2,3,4,5])(0.5) == 3
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Previous implementation didn't interpolate up to the last element in scaleArr,
one would expect that
interpolateArray([1,2,3,4,5])(1) == 5
but the output was 4, interpolateArray([1,2,3,4,5])(0.5) was 2.5 instead of 3,
e.g. it treated the input array as it were one element shorter.
This implementation behaves in such a way that
interpolateArray([1,2,3,4,5])(1) == 5
interpolateArray([1,2,3,4,5])(0) == 1
interpolateArray([1,2,3,4,5])(0.5) == 3