[ruby-core:26035] Re: [Bug #2189] Math.atanh(1) & Math.atanh(-1) should not raise an error

Hi,

I reverted r25279. You had to discuss at ruby-core about how Math
module should behave before changing it.

2009/10/10 Marc-Andre Lafortune <[e-mail]>:
> Regression caught by RubySpec.
>
> $ rubydev -v -e 'p Math.atanh(1)'
> ruby 1.9.2dev (2009-10-09 trunk 25274) [x86_64-darwin10.0.0]
> -e:1:in `atanh': Numerical argument out of domain - atanh (Errno::EDOM)
> rom -e:1:in `<main>'
> $ ruby187 -v -e 'p Math.atanh(1)'
> ruby 1.8.7 (2008-08-11 patchlevel 72) [universal-darwin10.0]
> Infinity

As akr mentioned, your commit broke test-all. You should make test-all
before commit, particularly when you changed some feature.
If there is difference between test-all and rubyspec, maybe test-all is right.

Ruby 1.9.2's behavior around Numeric, Math, CMath, Mathn and
BigDecimal has been discussed in order to bring more consistency on
them.
So difference between 1.8 and 1.9 around them does not always mean
1.9's regression. They are under discussion (at ruby-dev).

Then, OK everyone. Which is correct? domain error or infinity?

-- Yuki Sonoda (Yugui)