I need a simple DG node that uses connected mesh and copies vertex 
coordinates to output MPoint array.
I am having trouble with setting this array with MArrayDataBuilder. It 
ether always stays zero-length or grows on every compute().
This surely must be simple to do, but I'm stuck. Can anybody help ?
One important detail - I need this array to be made of compound points so 
that I can query individual coordinates as attributes.

code:
https://pastebin.ubuntu.com/p/ZyY52k2dTN/

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