pg_stat_statements IN problem

Hello,

I would like to ask about a problem that is bothering me for a while now. We have implemented monitoring of our queries using pg_stat_statements. The only problem we have with it is that expressions with

IN ('first', 'second', 'third')

get translated into a query as

IN ($1, $2, $3)

and not as 

IN $1

This obfuscates our monitoring because the same query with different amount of arguments get translated into this:

IN ('first', 'second')

and so on.

I was trying to find some discussions about it, but could not find much. One suggestion was to use

= ANY

but that is a problem when using some third party framework for db operations, in our case for python, for example web2py's DAL or sqlalchemy. 

Is there a possibility the pg_stat_statements will be improved with handling IN? This problem makes it so much less useful right now.

Or is there something I could do to have the statistics for such queries aggreageted? Or is there something else I am missing?

Best regards

Lukas Jerabek