From: Run Paint Run Run <redmine@...>
Date: 2009-06-15T11:25:53+09:00
Subject: [ruby-core:23859] [Bug #1636] Rational#coerce(Rational) Raises TypeError

Bug #1636: Rational#coerce(Rational) Raises TypeError
http://redmine.ruby-lang.org/issues/show/1636

Author: Run Paint Run Run
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.2dev (2009-06-14 trunk 23689) [i686-linux]

On 1.9.2 trunk:

    >> Rational(2).coerce(Rational(2))
    TypeError: Rational can't be coerced into Rational
	from (irb):1:in `coerce'
	from (irb):1
	from /usr/local/bin/irb:12:in `<main>'

However:

    >> 2.coerce(2)
    => [2, 2]

    >> 2.2.coerce(2.2)
    => [2.2, 2.2]

Indeed, the documentation for Numeric#coerce states "If _aNumeric_ is the same type as _num_, returns an array containing _aNumeric_ and _num_."

It also works on 1.8.7:

    >> Rational(1).coerce(Rational(1)
    => [Rational(1, 1), Rational(1, 1)]

I suspect this should be special cased, for consistency if nothing else.


----------------------------------------
http://redmine.ruby-lang.org