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Thank you for your feedback =)

Well, Array.range(-1,1) should return [-1]. You've read the description wrong:

Array.range(start, count) should return an array containing 'count' numbers from 'start' to 'start + count'.

Honestly, that line is still misleading, since start + count isn't part of the array. However, the second argument isn't an upper bound on the range, but the number of elements. Some other examples to make this clear:

// for any i:
    Array.range(i,0) == []             // no element
    Array.range(i,1) == [i]            // one element
    Array.range(i,2) == [i, i+1]       // two elements
    Array.range(i,3) == [i, i+1, i+2]  // three elements

// some concrete examples:
    Array.range(100, 1) == [100]
    Array.range(10, 1)  == [10]
    Array.range(-10, 4) == [-10, -9, -8, -7]
    Array.range(12515235, 0) == []

HTH.