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BUG: Fix pandas backends to have inclusive preceding window bound #2009
Fix for issue #2000.
Currently, pandas backends pass the preceding bound directly as the window size and do not adjust for the inclusive window bounds in ibis.
This PR implements the correct expected behavior and updates the pandas backend tests accordingly.
@jreback not quite sure I follow. I thought
In Ibis, the left row bound is already expected to be a closed bound.