1
I think the issue is you are using a cast, try using io.wchar.to_string() [https://valadoc.org/glib-2.0/uint64.to_string.html]
Edit:
This worked for me based on your code, casting gave me a segfault.
struct Monitor.IO {
public uint64 wchar;
}
int main (string[] args) {
Monitor.IO io = {};
io.wchar = 111111;
warning (io.wchar.to_string ()); ...
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