Hi,

In message "Re: [ruby-core:24116] [Bug #1715] Numeric#arg for NaN is Inconsistent Across Versions"
    on Fri, 3 Jul 2009 00:26:44 +0900, Run Paint Run Run <redmine / ruby-lang.org> writes:

|Numeric#arg gives 0 for NaN on 1.9; Pi for NaN on 1.8:

Both versions should return NaN for NaN.

							matz.