Extend Surface with Negative value

Grasshopper
1

Hi, Wombat has a component that Extends Surface into the chosen direction, but only goes with positive value. I found this old topic, has a C# component works very well. Negative value goes with Split Surface method, but sometime its not work with WEST direction (see attached file below). Can someone help me to debug it?
SplitSur.gh (5.3 KB)

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2

Try the attached

Surface_extend_V1A.gh (12.6 KB)

Note: that’s an indicative/entry level take on that matter: no checks included (d, result etc etc) PLUS BrepFaces are not supported. IF you are familiar with C# try to do the complete thingy.

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