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+* `IO#to_json` now returns the `to_s` representation, rather than
+ attempting to convert to an array. This fixes a bug where `IO#to_json`
+ would raise an `IOError` when called on an unreadable object.
+
+ Fixes #26132.
+
+ *Paul Kuruvilla*
+
* Remove deprecated `halt_callback_chains_on_return_false` option.
*Rafael Mendonça França*