@Serial
	private void readObject(final ObjectInputStream stream)
		throws InvalidObjectException
	{
		throw new InvalidObjectException("Serialization proxy required.");
	}
Create a new ephemeral constant with the given value {@code supplier}.
For every newly created operation tree, a new constant value is chosen
for this terminal operation. The value is then kept constant for this tree.

@param supplier the value supplier
@param <T> the constant type
@return a new ephemeral constant
@throws NullPointerException if the {@code supplier} is {@code null}
jenetics.prog/src/main/java/io/jenetics/prog/op/EphemeralConst.java