SUMMARY

Calling a method on a D-Bus object can fail if the method has arguments of a
specific number signature, such as uint32.


STEPS TO REPRODUCE

1. Monitor kwin script output:

```
journalctl -b -f | grep -i "kwin"
```

2. Open the KWin Scripting Console

3. Call the `Inhibit` method on `org.freedesktop.Notifications`, which works as
   expected:

```javascript
callDBus(
    "org.freedesktop.Notifications",
    "/org/freedesktop/Notifications",
    "org.freedesktop.Notifications",
    "Inhibit",
    "",
    "",
    {},
    function (reply) {
        console.info("Callback. Reply: " + reply);
    }
);
```

4. Check the output of the journal, which should show the
   message "Callback. Reply: $number" - I'll assume it was 1 for the sake of 
   this example. Do Not Disturb should have been enabled.

5. Call the method `UnInhibit` on `org.freedesktop.Notifications`, which expects
   a uint32 as argument:

```javascript
callDBus(
    "org.freedesktop.Notifications",
    "/org/freedesktop/Notifications",
    "org.freedesktop.Notifications",
    "UnInhibit",
    1,
    function (reply) {
        console.info("UnInhibit callback. Reply: " + reply);
    }
);
```


OBSERVED RESULT

KWin journal output shows it failed due to no method with the signature:

```
kwin_wayland[4962]: warning:kwin_scripting:unknown:0 - Received D-Bus message is error: "No such method 'UnInhibit' in interface 'org.freedesktop.Notifications' at object path '/org/freedesktop/Notifications' (signature 'i')"
```

The method `UnInhibit` expects a uint32 as argument, but callDBus is trying with 
an int `(signature 'i')`.


EXPECTED RESULT

The method `UnInhibit` should be called successfully, and Do Not Disturb should 
be disabled.


SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.8.7-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C56
System Version: 2.0


ADDITIONAL INFORMATION

This is probably because `QJSValue::toVariant()` only converts to int or double
for numbers, and special handling is needed to check for other types:

https://invent.kde.org/plasma/kwin/-/blob/7949032411153ebf9d87b0e936b1bc288df12b38/src/scripting/scripting.cpp#L344

Interestingly, if `UnInhibit` is called without a callback, it fails silently.
The error from kwin about the type mismatch is only output if a callback is 
provided.