Allow passing unsigned integer to signed type in/out/ref parameter and vice versa
An example that needs this is AtomicInt methods:
namespace AtomicInt
public int @get (ref int atomic)
public void @set (ref int atomic, int newval)
....If a uint value is passed to the atomic parameter, the compiler produces an error; error: Argument 1: Cannot convert from `uint' to `int'. According to GLib documentation, however, the atomic parameter could be either int or uint.
atomic : a pointer to a gint or guint
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