UnfoldedRDKFingerprintCountBased returns a different fingerprint length for every molecule

[greglandrum]

Here's the reproducible:

>>> ms = [Chem.MolFromSmiles(x) for x in ('c1ccccc1','CCCC')]
>>> fps = [Chem.UnfoldedRDKFingerprintCountBased(x) for x in ms]
>>> [x.GetLength() for x in fps]
[3764713634, 4275705117]

Expected behavior
Those fingerprints should all be the same length

Configuration (please complete the following information):

• RDKit version: all
• OS: all

Additional context
I guess no one is actually using this code, because you can't calculate similarity between these FPs unless you get really luck.