From: "hsbt (Hiroshi SHIBATA)" <shibata.hiroshi@...>
Date: 2013-04-03T10:12:03+09:00
Subject: [ruby-core:53917] [ruby-trunk - Bug #8204] ObjectSpace.each_object(Bignum) can generate Bignums that are to small to be Bignums


Issue #8204 has been updated by hsbt (Hiroshi SHIBATA).

Category set to core
Assignee set to ko1 (Koichi Sasada)
Target version set to current: 2.1.0


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Bug #8204: ObjectSpace.each_object(Bignum) can generate Bignums that are to small to be Bignums
https://bugs.ruby-lang.org/issues/8204#change-38132

Author: Hanmac (Hans Mackowiak)
Status: Open
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: core
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-04-02 trunk 40068) [x86_64-linux]


when i do:

p ObjectSpace.each_object(Bignum).to_a
=> [18446744073709551615, 3, 2394213621560389257607583714845333205]
and again:
ObjectSpace.each_object(Bignum).to_a
=> [18446744073709551615, 3, 63326588221939058800767348888534802301, 0, 0, 0]


my question: why does the 3 and the zeros show up?

n = ObjectSpace.each_object(Bignum).min #=> 0
p n.class #Bignum
p n.zero? #=> false
p n < 0 # true

okay this means i have a zero, that looks like zero, but is not a zero and its class is Bignum

(but when i try in a new ruby session)

(2**64) < 0;
p bigZero = ObjectSpace.each_object(Bignum).min #=> 0
p bigZero.class #Bignum
p bigZero.zero? #=> true

okay, this time i get a zero that looks like a zero, and react like a zero, but its still a Bignum


so where does the zeros come from and why does they react so totaly different?


-- 
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