I'm running into an issue where `\clist_if_in:NnF` doesn't work as expected when used with `prop` keys.

Here's the setup. I have a set of key-value "rules" in a `prop` where the key is supposed to be some identifying keyword and the value is the rule text. Then I have a command `\PrintRules` to print all the defined rules.

Sometimes I want to exclude some rules from the printout. So the `\PrintRules` command takes an optional `clist` of rule keywords to exclude. Here's what I have:

```
\documentclass{article}

\ExplSyntaxOn
% Declare the rules prop and a command to add a rule
\prop_new:N \l_rules_prop
\newcommand{\addrule}[2]{
  \prop_put:Nnn \l_rules_prop {#1} {#2}
}

% Declare the optional exclude clist
\keys_define:nn { rules } {
  exclude .clist_set:N = \l_exclude_clist,
  exclude .value_required:n = true
}

% Command to print the rules
\NewDocumentCommand{\PrintRules}{O{}}{
  \keys_set:nn { rules } {#1}

  % Debug: list excluded rules
  \clist_use:Nn \l_exclude_clist {,~}

  \begin{itemize}
    % Iterate over all defined rules
    \prop_map_inline:Nn \l_rules_prop {
      % If the rule was not excluded, print it
      \clist_if_in:NnF \l_exclude_clist {##1} {
        \item ##2
      }
    }
  \end{itemize}
}
\ExplSyntaxOff

% Add some rules
\addrule{ruleone}{Rule one text.}
\addrule{ruletwo}{Rule two text.}
\addrule{rulethree}{Rule three text.}
\addrule{rulefour}{Rule four text.}

\begin{document}

% Print the rules but exclude rules 2 and 4
\PrintRules[exclude={ruletwo,rulefour}]

\end{document}
```

With the above, I get the following output:
![image.png](/image?hash=d6286d0b011b5c1dc860be7caedfbe1b07af2ffc4772b954df19a8869933008a)
Even though I can see the excluded rules are in the `clist`, for some reason the conditional doesn't see them.

This does work if I limit the keywords to simple numbers:
```
\addrule{1}{Rule one text.}
\addrule{2}{Rule two text.}
\addrule{3}{Rule three text.}
\addrule{4}{Rule four text.}

\PrintRules[exclude={2,4}]
```

![image.png](/image?hash=2d2c12531d0287808eda366c1444eb5778bcb916675627023e3833bdcd6c6573)

But I would rather have descriptive keywords instead.

Does anyone know what I'm doing wrong?