static bool Unset(ref NPropertyBag head, NProperty key)
{
var e = head.GetEntry(key);
if (e == null)
{
return(false); // value not changed -> do nothing
}
head = head.Clone();
head.Remove(key);
return(true);
}
static bool Set(ref NPropertyBag head, NProperty key, object value)
{
var e = head.GetEntry(key);
if (e != null && Equals(e._value, value))
{
return(false); // value not changed -> do nothing
}
head = head.Clone();
head.Set(key, value);
return(true);
}
