tl;dr WordPress 4.2.4 RC1 is available (download) for testing and fixes an issue with inline scripts. A change in WordPress 4.2.3 had the unintentional side effect of breaking some inline scripts when the CDATA block is used (see #33106). For example, consider the intended content here: // In 4.2.2, this content is left as is and _my_function() fires as expected. In 4.2.3, the content is manipulated as such: // This results in the script being commented out by the // and it will not fire. A workaround for this is to use /* for commenting. /* */ However, this workaround should not be necessary. As a result, we intend on releasing WordPress 4.2.4 to fix this issue. Additionally, WordPress 4.2.3 caused issues when using shortcodes within angle brackets (see #33116). For example, this shortcode usage worked in 4.2.2 but did not work in 4.2.3: While we do not recommend this use of shortcodes and strongly encourage plugin developers to move away from this use of shortcodes, the breakage was unintentional
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