[ruby-core:86406] [Ruby trunk Feature#14643] Remove problematic separator '\0' of Dir.glob and Dir.[]

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Issue #14643 has been updated by nobu (Nobuyoshi Nakada).


I've missed to set `warned` flag, and rubyspec shows the warning.

```diff
diff --git a/spec/ruby/core/dir/shared/glob.rb b/spec/ruby/core/dir/shared/glob.rb
index 40973995c1..2fe22ac6c3 100644
--- a/spec/ruby/core/dir/shared/glob.rb
+++ b/spec/ruby/core/dir/shared/glob.rb
@@ -25,9 +25,11 @@
     Dir.send(@method, obj).should == %w[file_one.ext]
   end
 
-  it "splits the string on \\0 if there is only one string given" do
-    Dir.send(@method, "file_o*\0file_t*").should ==
-             %w!file_one.ext file_two.ext!
+  ruby_version_is ""..."2.6" do
+    it "splits the string on \\0 if there is only one string given" do
+      Dir.send(@method, "file_o*\0file_t*").should ==
+        %w!file_one.ext file_two.ext!
+    end
   end
 
   it "matches non-dotfiles with '*'" do
```

----------------------------------------
Feature #14643: Remove problematic separator '\0' of Dir.glob and Dir.[]
https://bugs.ruby-lang.org/issues/14643#change-71335

* Author: usa (Usaku NAKAMURA)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
`Dir.glob` and `Dir.[]` accepts `'\0'` separated string as the parameter,
but this feature is very problematic.
Shouldn't we remove this feature for Ruby3 ?



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