[Issue 24656] enums with explicit EnumBaseType incorrectly matching multiple overloads.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24656

--- Comment #3 from basile-z <b2.temp at gmx.com> ---
This looks invalid to me. Implcit conversions between signed and unsigned
allows things like

```
void main(){
    byte a;
    a = ubyte(255);
}     
```

Problem in the original report is more about signess but signess does not play
a role in overload resolution.

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