Long.valueOf(String) should cache

A DESCRIPTION OF THE REQUEST :
The source code for Long.valueOf(String) shows that it returns new Long(parseLong(...)). It really should return Long.valueOf(parseLong(...)) so that it can take advantage of the cache.

JUSTIFICATION :
More efficient.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
See above
ACTUAL -
See above

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None -- see source code for java.lang.Long
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