[sqlalchemy] Authoring Dialects: How to Fix AssertionError: assert Decimal('15.7563') in [15.7563] ?

I am authoring a dialect for our database technology and one of the tests is failing, but I am not quite sure why, or how to proceed. Would someone know where I'd look, or what I may be missing, to fix this aspect of the dialect? I am likely missing something, but I've already messed with the

[sqlalchemy] Re: Authoring Dialects: How to Fix AssertionError: assert Decimal('15.7563') in [15.7563] ?

The code is here: https://github.com/rbuck/sqlalchemy-nuodb Instructions (notably for pip dependencies) are documented in the README.rst file. The test is the SQL Alchemy compliance test suite. I am down to 12 or less failures now, so I am almost defect free.