default boolean identical(final Tree<?, ?> other) {
		return this == other;
	}
Tests whether {@code this} node is the same as the {@code other} node.
The default implementation returns the object identity,
{@code this == other}, of the two objects, but other implementations may
use different criteria for checking the <i>identity</i>.

@param other the {@code other} node
@return {@code true} if the {@code other} node is the same as {@code this}
        node.
jenetics.ext/src/main/java/io/jenetics/ext/util/Tree.java