Description:
BREAK-POINTS CURVE: a 2D function defined by a list of [x,y] coordinates.
BPC objects are constructed from the list of X coordinates (<x-points>) and the list of Y coordinates (<y-points>)
<x-point> are NOT necesarily increasing (contrary to BPF objects).
If <x-list> and <y-list> are not of the same length, the last step in the shorter one is repeated.
<decimals> allows to specify the precision of the function (0 = integers, n > 0 = number of decimals)
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