in URLs) and rel="noopener" on links with target attributes,
to prevent them from overwriting the original frame.
-4.9.0 was skipped due to a packaging problem; 4.9.2 fixes two
-major regressions in PHP 5.3 support and entity decoding; no
-other functional changes were applied.
+4.9.3 works around an infinite loop bug in PHP 7.1 with the opcode
+cache (and has one other, minor bugfix, avoiding using autoloading
+when testing for DOMDocument presence). If these bugs do not
+affect you, you do not need to upgrade.