private static void EnsureTypeConsistency(Atom left, Atom right)
{
if (left._type != right._type)
throw new InvalidCastException(String.Format("{0} and {1} types are not compatible", left._type, right._type));
}
public bool Equals(Atom obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
return obj._doubleValue == _doubleValue;
}