When a node selection is copied to clipboard, a .cpiobinary file is generated in $HOUDINI_TEMP path. If the exact same selection is copied multiple times, each of the generated .cpiofiles will differ from the others (when hashed, they all return different results), even though they all hold the same set of nodes.

I have two questions regarding this issue:

1. What data causes this difference? Perhaps a timestamp of the copy to clipboard operation?
   
2. Is it possible to prevent this from happening?