Add support for PHP 8.1 #1
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Most non-final internal methods now require overriding methods to declare a compatible return type, otherwise a deprecated notice is emitted during inheritance validation. In case the return type cannot be declared for an overriding method due to PHP cross-version compatibility concerns, a #[ReturnTypeWillChange] attribute can be added to silence the deprecation notice.
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Migrating from PHP 8.0.x to PHP 8.1.x
Another solution (but incompatible with PHP < 8.0) is to add the
mixedreturn type toCachingGenerator::current().Also see: https://wiki.php.net/rfc/internal_method_return_types.