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February 2024

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[ruby-core:116493] [Ruby master Bug#20226] Inconsistent Sort results on 3.3.0 compared to previous versions
by omerby (Omer Ben Yosef) 01 Feb '24

01 Feb '24

Issue #20226 has been reported by omerby (Omer Ben Yosef). ---------------------------------------- Bug #20226: Inconsistent Sort results on 3.3.0 compared to previous versions https://bugs.ruby-lang.org/issues/20226 * Author: omerby (Omer Ben Yosef) * Status: Open * Priority: Normal * ruby -v: 3.3.0 * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Try this code block: ``` [-0.9, -0.88, -0.85, -0.83, -0.81, -0.79, -0.77, -0.75, -0.73, -0.71, -0.69, -0.67, -0.65, -0.63, -0.6, -0.58, -0.56, -0.54, -0.52, -0.5, -0.48, -0.46, -0.44, -0.42, -0.4, -0.38, -0.35, -0.33, -0.31, -0.29, -0.27, -0.25, -0.23, -0.21, -0.19, -0.17, -0.15, -0.13, -0.1, -0.08, -0.06, -0.04, -0.02, 0.0, 0.02, 0.0, 0.02].sort_by(&:abs) ``` The end result should be the numbers absolute sorted, look at the last 5 numbers of this, the end result of them should be `[0.0, 0.0, -0.02, 0.02, 0.02...]` maintaining the original order, and this behavior is what we see on ruby 3.2.0, however on ruby 3.3.0 the end result will be `[0.0, 0.0, 0.02, 0.02, -0.02...]` This is also inconsistent, as `[-0.02, 0.0, 0.02, 0.0, 0.02].sort_by(&:abs)` will actually provide the expected result. Again, the main issue for us is the difference between 3.3.0 and previous versions of ruby. -- https://bugs.ruby-lang.org/

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[ruby-core:115978] [Ruby master Bug#20104] Regexp#match returns nil but allocates T_MATCH objects
by jeremyevans0 (Jeremy Evans) 01 Feb '24

01 Feb '24

Issue #20104 has been reported by jeremyevans0 (Jeremy Evans). ---------------------------------------- Bug #20104: Regexp#match returns nil but allocates T_MATCH objects https://bugs.ruby-lang.org/issues/20104 * Author: jeremyevans0 (Jeremy Evans) * Status: Open * Priority: Normal * ruby -v: ruby 3.4.0dev (2023-12-30T03:14:38Z master 8e32c01742) [x86_64-openbsd7.4] * Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONTNEED, 3.3: REQUIRED ---------------------------------------- Between Ruby 3.2 and 3.3, behavior changed so that Regexp#match will allocate a T_MATCH object even when there is no match. Example code: ```ruby h = {} GC.start GC.disable ObjectSpace.count_objects(h) matches = h[:T_MATCH] || 0 md = /\A[A-Z]+\Z/.match('1') ObjectSpace.count_objects(h) new_matches = h[:T_MATCH] || 0 puts "/\\A[A-Z]+\\Z/.match('1') => #{md.inspect} generates #{new_matches - matches} T_MATCH objects" ``` Result with Ruby 1.9-3.2: ``` /\A[A-Z]+\Z/.match('1') => nil generates 0 T_MATCH objects ``` Results with Ruby 3.3.0 and current master branch: ``` /\A[A-Z]+\Z/.match('1') => nil generates 1 T_MATCH objects ``` This results in a measurable performance decrease for both Sinatra and Roda web applications, as reported at: https://old.reddit.com/r/ruby/comments/18sxtv9/ruby_330_performance_ups_and… Thanks to GitHub users kiskoza and tagliala for producing a minimal example showing this issue: https://github.com/caxlsx/caxlsx/issues/336 -- https://bugs.ruby-lang.org/

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