I am not familiar with the module but in the docs it says:
Spaces, symbols and non-printable characters are only considered for splitting the string into its parts but not for sorting. For instance foo-bar-42 is broken in three substrings foo, bar and 42 and after that the dashes are ignored.
For the examples you give the sort order would then be:
Which to my mind is correct. You might be able to use some variation of the Schwartzian Transform
to achieve your desired output.
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