Did class Double change in 1.5?!! (Or is this a bug?)

In my mind, if I use Double.valueOf, it has to be like this:
String stringValue = "2.0";
Double doubleValue = Double.valueOf(stringValue);
However, the 1.5 javac is currently allowing me to use valueOf and cast the answer to a native.
double doubleValue = Double.valueOf(stringValue);
-- No compliation error -
What's going on here? Did I miss the memo?
If I write the same code in 1.4, the compiler spits up.

Nevermind - answered my own question.
Must be that new-fangled auto-boxing/deboxing stuff from C++.
You kids and your gee-wiz toys ...
I foresee a road paved with good intentions.

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