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Support for points that are "doublly removed".

description

Example:
 
f(x) = 1 | x < 0
   2 | x = 0
   3
 
This should result in horizontal line at y = 1 ending at an open circle at (0,1), filled circle at (0,2), another open circle at (0,3) with horizontal line at y = 3 going right.

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