Setting template variables by reference allowed violating the principle of data being
immutable once added to the skin template. In practice, this method was not being
used for that. Rather, setRef() existed as memory optimisation for PHP 4.
+* Passing false to ParserOptions::setWrapOutputClass() is deprecated. Use the
+ 'unwrap' transform to ParserOutput::getText() instead.
+* ParserOutput objects generated using a non-default value for
+ ParserOptions::setWrapOutputClass() can no longer be added to the parser
+ cache.
== Compatibility ==
MediaWiki 1.31 requires PHP 5.5.9 or later. Although HHVM 3.18.5 or later is supported,