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Bug
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Resolution: Fixed
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Minor
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4.3.7, 4.4.3
After 'fixing' some issues with this filter recently and informing people via an environment check that the PHP extension was not installed, we're seeing just how broken it actually is.
The decision has been made to disable it on stables and remove it on core. It will never work and it actively breaks JS with no option to stop it from doing so.