From: shevegen@... Date: 2016-03-20T16:09:06+00:00 Subject: [ruby-core:74476] [Ruby trunk Bug#12198] Hash#== sometimes returns false incorrectly Issue #12198 has been updated by Robert A. Heiler. Here is Hash#rehash link: http://ruby-doc.org/core-2.3.0/Hash.html#method-i-rehash Perhaps the documentation could be updated regardless, to also notify the ruby user when .rehash may be useful. For instance, this is the first time that I read about two sets with the same content, may be considered not equal and that a .rehash can fix this behaviour displayed. I don't think I have actually seen .rehash used before yet, one can always learn something new in these bug reports. :) ---------------------------------------- Bug #12198: Hash#== sometimes returns false incorrectly https://bugs.ruby-lang.org/issues/12198#change-57595 * Author: Sebastian Skalacki * Status: Assigned * Priority: Normal * Assignee: Akinori MUSHA * ruby -v: ruby 2.4.0dev (2016-03-11 trunk 54086) [x86_64-darwin14] * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN ---------------------------------------- Hi! Sorry for lack of the accuracy in the bug title. I have some trouble with pinpointing the issue. According to documentation, "two hashes are equal if they each contain the same number of keys and if each key-value pair is equal to (according to Object#==) the corresponding elements in the other hash." I was able to produce two hashes which satisfy this condition, however the method returns false. In other words, following happens: ~~~ e.class #=> Hash r.class #=> Hash e.size == r.size #=> true e.each_pair.to_a == r.each_pair.to_a #=> true e == r #=> false ~~~ That happens in Ruby 1.9.3, 2.3, 2.4 and probably in other versions as well. Pure Ruby, no gem could interfere. Happy Easter ]:-> ---Files-------------------------------- problem.rb (1.69 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: