Try to find a type that the two test frameworks can agree on.

Passes in both on this machine.

The basic problem is that YAML IT compares according to toString. We're just lucky that float 3.0 and decimal 3.0 have the same. And FTS uses Python's ==. Again, we're lucky that whatever comes out of pgYAML and whatever comes out of psycopg2, probably a float and a decimal, overload that.