[Community] strange behaviour for union function

[Emmanuel Lambert]

Hello Sean,

> 1) Implement a point-in-polygon algorithm specifically for numpy (I'd
> be interested in this too)

that one would be most suitable for my application. 
Would it be possible that you draft the detailed signature and semantics
of this function (in line with the existing framework), then maybe I can
contribute on the implementation.

wbr
Emmanuel