Patentsview Plant Patent Sorting Problem

Here's a get to the patents endpoint for three plant patents. q={"patent_number":["PP4000","PP24000","PP10000"]}&s=[{"patent_number":"asc"}]
I asked for the sort to be by patent number asc. It looks like an alpha sort is being applied. The sql might need to be "order by length(patent_number), patent_number"
Utility patents might have the same problem when the patent number gets to 10,000,000. As I write this utility patent number 9,479,999 has been issued.

Update: The 10 millionth patent has been issued and is now in the patentsview database! As predicted, the sort is alphabetic rather than numeric.