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Props lev0.

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Test using WordPress Playground

The changes in this pull request can previewed and tested using a WordPress Playground instance.

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• The Plugin and Theme Directories cannot be accessed within Playground.
• All changes will be lost when closing a tab with a Playground instance.
• All changes will be lost when refreshing the page.
• A fresh instance is created each time the link below is clicked.
• Every time this pull request is updated, a new ZIP file containing all changes is created. If changes are not reflected in the Playground instance,
  it's possible that the most recent build failed, or has not completed. Check the list of workflow runs to be sure.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Test this pull request with WordPress Playground.

Can also confirm that new unit test fails on parent commit of this PR:

$ vendor/bin/phpunit --verbose tests/phpunit/tests/option/updateOption.php 
Installing...
Running as single site... To run multisite, use -c tests/phpunit/multisite.xml
Not running ajax tests. To execute these, use --group ajax.
Not running ms-files tests. To execute these, use --group ms-files.
Not running external-http tests. To execute these, use --group external-http.
PHPUnit 9.6.16 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.10-2ubuntu1
Configuration: /home/roy/path/to/wordpress-develop/phpunit.xml.dist
Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

.........F                                                        10 / 10 (100%)

Time: 00:00.051, Memory: 42.50 MB

There was 1 failure:

1) Tests_Option_UpdateOption::test_stored_sanitized_value_from_update_of_nonexistent_option_should_be_same_as_that_from_add_option
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'x_y'
+'x_y_y'

/home/roy/path/to/wordpress-develop/tests/phpunit/tests/option/updateOption.php:249