Why does Java Language Spec allow this: \uuuu0041?

Question

Why does the Java Language spec allow a unicode escape sequence to contain 1 or more 'u' characters before the 4 hex characters?

How do we print the 'A' character?

char c = '\u0041';
System.out.println("c: " + c);

// Prints: 
// c: A

Ok, but this prints 'A' too:

char c = '\uu0041';
System.out.println("c: " + c);

// Prints: 
// c: A

As does this:

char c = '\uuuuuuuuuuuuu0041';
System.out.println("c: " + c);

// Prints: 
// c: A

So there seems to be an infinite number of unicode escape sequences to represent any unicode escape sequence (ha!).

Question: What purpose does this serve in the language?