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Use reference equality to determine whether two references point to the same object.

Automated Detection

Coverity Prevent 5.0	The BAD_EQ checker can detect instances where the `==` operator is being used for equality of objects when, ideally, the `equals()` method should have been used. The `==` operator could consider the objects to be different, whereas the `equals()` method would consider them to be the same.
[FindBugs 2008]	ES: Comparison of String objects using == or !=

MITRE CWE	CWE ID 595, "Comparison of Object References Instead of Object Contents"
	CWE ID 597, "Use of Wrong Operator in String Comparison"
[Rogue 2000]	Rule 79: Use `equals()`, not `==`, to test for equality of objects

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