ChapmanMeanLength returns nearly the same value

[David-Maisonave]

ChapmanMeanLength always returns 9.xx regardless of the inputs.
Here's the result when comparing "David" to the following associated strings:

David	9.223682
Dave	9.299208
Davdi	9.223682
Dadiv	9.223682
david	9.223682
Dovid	9.223682
Divad	9.223682
divaD	9.223682
Daves	9.223682
Maday	9.223682
xxxxx	9.223682
12345	9.223682
Dav id	9.148616
Da.v.id	9.07401
D-avid	9.148616

The first row should have a zero distance, but it returns a values which is the same to strings "xxxxx" and "12345".
I looked at the source code, and I don't see how this class could perform string comparisons.
Is this an incomplete class?

[StefH]

When I read the "description" from ChapmanMeanLength it seems that is not implemented as we would think.

I did ask ChatGPT for an implemenation, and I'll add this as ChapmanMeanLengthTrue class.

[David-Maisonave]

I get the sense that ChapmanMeanLength is not really a string matching algorithms. But it's true purpose is not clear to me.

FYI:
I'm using slightly modified version of the SimMetrics code in my own project.
SqliteFuzzyPlusExtension.

Most of the algorithms work great. ChapmanMeanLength is the only one I had issues with.