divide(Object, Object) with (NaN, 0) does not return NaN

fix for this issue

Ah, I see the question now.

Here we are dividing a double by a long. In the first case, this is parsed as divide(Object, long) which then calls divide(Object, Object), which throws ArithmeticException if the second arg is 0 (regardless of the first arg).

In the second case it's parsed as divide(double, long) which just relies on Java to properly upcast the primitive long to a double to do the divide.

Note that making this call with 2 doubles does return NaN:

or type hinting x to a double works as well:

I think one option to "fix" this behavior would be to add checks in divide(Object, Object) to check whether x is NaN and instead return NaN.

Comment made by: yongqli

But in the first example it produces an ArithmeticException.

As per the Java Language Specification (http://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.2.4),

"All numeric operations with NaN as an operand produce NaN as a result."