The new parameter of curl_security_helper::url_is_blocked() introduced
in MDL-71916 became part of the API. Even if we reverted it quickly,
someone can use a released Moodle version that has that parameter in
place. For that reason and also to avoid potential troubles in the
future (e.g. when yet another argument would be added to this method),
we need to make it clear that the second parameter of this method should
never be used again.
Poor $maxredirects, you did not live long with us. Oh well.
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