How to test equality of MongoDB filters (BSON) in Java/Groovy?

I'm generating MongoDB-queries unsing the Filters-API.

Bson r1 = Filters.and(Filters.eq("a","b"), Filters.eq("c","d"))
Bson r2 = Filters.and(Filters.eq("a","b"), Filters.eq("c","d"))

But how can I check the result for equality? For example:

r1.equals(r2)

and

r1.dump().equals(r2.dump())

don't work.