[ruby-core:119800] [Ruby master Bug#20857] Ruby 3.4 seems to have backwards compatibility issues more than its predecessors

Issue #20857 has been updated by mame (Yusuke Endoh).

Status changed from Assigned to Closed

At the dev meeting, I explained the findings of the incompatibility to matz. He stated that it was within the expected range of impacts and that no revert would be made.

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Bug #20857: Ruby 3.4 seems to have backwards compatibility issues more than its predecessors
https://bugs.ruby-lang.org/issues/20857#change-110485

* Author: vo.x (Vit Ondruch)
* Status: Closed
* Assignee: matz (Yukihiro Matsumoto)
* ruby -v: ruby 3.4.0dev (2024-10-15 master 3da3cabf98) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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Testing Ruby 3.4 in Fedora, I just hit issue like this in AsciiDoctor test suite:

~~~
  1) Failure:
Minitest::Test::TestExtensions::TestIntegration#test_should_assign_captures_correctly_for_inline_macros [test/extensions_test.rb:1382]:
--- expected
+++ actual
@@ -1,9 +1,9 @@
 "target=\"\", attributes={}
-target=\"value,key=val\", attributes={1=>\"value\", \"key\"=>\"val\", \"name\"=>\"value\"}
-target=\"\", attributes={\"text\"=>\"\"}
-target=\"[text]\", attributes={\"text\"=>\"[text]\"}
+target=\"value,key=val\", attributes={1 => \"value\", \"key\" => \"val\", \"name\" => \"value\"}
+target=\"\", attributes={\"text\" => \"\"}
+target=\"[text]\", attributes={\"text\" => \"[text]\"}
 target=\"target\", attributes={}
-target=\"target\", attributes={1=>\"value\", \"key\"=>\"val\", \"name\"=>\"value\"}
-target=\"target\", attributes={\"text\"=>\"\"}
-target=\"target\", attributes={\"text\"=>\"[text]\"}
+target=\"target\", attributes={1 => \"value\", \"key\" => \"val\", \"name\" => \"value\"}
+target=\"target\", attributes={\"text\" => \"\"}
+target=\"target\", attributes={\"text\" => \"[text]\"}
 target=\"target\", attributes={}"
~~~

This suggest that `Hash#inspect` formatting was changed and there are additional spaces around hash rocket. Is the space really worth of the troubles? BTW [here](https://github.com/asciidoctor/asciidoctor/issues/4634#issuecomment-2449497487) is AsciiDoctor upstream reaction and I share the sentiment.



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