From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2013-12-03T14:38:07+09:00
Subject: [ruby-core:58826] [ruby-trunk - Bug #9192][Assigned] Inconsistent	comparison between Float and BigDecimal


Issue #9192 has been updated by nobu (Nobuyoshi Nakada).

Category set to ext
Status changed from Open to Assigned
Assignee set to mrkn (Kenta Murata)

BigDecimal converts Float with to_r, and 706.06.to_r returns (1552642359815045/2199023255552).
But Float#to_r doesn't consider that Float is inexact, this is not equal to 706.06.
Converting by rb_flt_rationalize_with_prec() seems solving this issue, but makes BigDecimal test stuck.
----------------------------------------
Bug #9192: Inconsistent comparison between Float and BigDecimal
https://bugs.ruby-lang.org/issues/9192#change-43390

Author: vatsu (Gustavo Sales)
Status: Assigned
Priority: Normal
Assignee: mrkn (Kenta Murata)
Category: ext
Target version: 
ruby -v:  2.0.0p353 (2013-11-22 revision 43784) [x86_64-darwin11.4.2]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I was checking a possible inconsistency on ActiveModel and I found situations where comparing BigDecimal to Float differs to comparing Float to BigDecimal.

I have create a simple ruby script to exemplify the problem. The script is attach to this issue and output is as follows:

Instance number 706.05
###########
Instance number 706.06
Inconsistence:
0.70606E3 > 706.06
706.06 < 0.70606E3
=========
Inconsistence:
0.70606E3 <= 706.06
706.06 >= 0.70606E3
=========
###########
Instance number 706.07
Inconsistence:
0.70607E3 < 706.07
706.07 > 0.70607E3
=========
Inconsistence:
0.70607E3 >= 706.07
706.07 <= 0.70607E3
=========
###########
Instance number 706.08
###########


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