{unique} modifiers in renaming

[Jérôme]

 Hello all,
I am trying to use the {unique} modifier to rename files. There are 3 forms
described in the documentation (I button, right of the input box) but the
last one seems to have more options than the example:

 {unique:n,c,0}
 Add a suffix number, n specifies the number of digits to use, c specifies
the separator char before the numbers, a optional to include all options
for uniqueness, 0 optional to always pad with n zero digits

I haven't been able to use this last form, only an intermediary form works (
{unique:n,0} with modifier in green).

Does anyone know how the version with 4 options works?
DK 8.5.0 (Build date: 2024-08-22 13:01)

The online documentation does not describe all these options:
https://docs.digikam.org/en/main_window/image_view.html#renaming-photograph
(section just before Deleting a Photograph)
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