glib/glib.go
func (v *Value) SetDouble(val float64) {
	C.g_value_set_double(v.native(), C.gdouble(val))
}
func (v *Value) SetDouble(val float64) {
	C.g_value_set_double(v.native(), C.gdouble(val))
}
// SetDouble is a wrapper around g_value_set_double().