From: Kenta Murata <muraken@...>
Date: 2011-09-13T10:23:35+09:00
Subject: [ruby-core:39499] [Ruby 1.9 - Feature #5310] Integral objects


Issue #5310 has been updated by Kenta Murata.

Target version changed from 1.9.x to 2.0


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Feature #5310: Integral objects
http://redmine.ruby-lang.org/issues/5310

Author: Kenta Murata
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 2.0


I believe it is ambiguous what object can behave as an integral number.
I don't think the current use of Object#to_int isn't appropriate for this purpose.

The most understandable example is Float#to_int.
It should raise error for all float values because they always have uncertainty,
but it doesn't and returns an integral part of it.

I propose to change the use of Object#to_int for the next release of Ruby.
I recommend the following specification changes:

(1) Remove to_int method from Float and BigDecimal.
(2) Rational#to_int returns an Integer only if its denominator is 1. Otherwise, it raises an appropriate error.
(3) Complex#to_int returns the result of to_int of its real part only if its imaginary part is exactly zero (0.0 isn't exactly zero).

If anyone have another idea, please give me your comment.


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