20.5 Add support for concurrent connections
20.6 Use the RFC6265 test suite
20.7 Support LD_PRELOAD on macOS
+ 20.8 Run web-platform-tests url tests
21. Next SONAME bump
21.1 http-style HEAD output for FTP
properly. Look into making the preload support in runtests.pl portable such
that it uses DYLD_INSERT_LIBRARIES on macOS.
+20.8 Run web-platform-tests url tests
+
+ Run web-platform-tests url tests and compare results with browsers on wpt.fyi
+
+ It would help us find issues to fix and help us document where our parser
+ differs from the WHATWG URL spec parsers.
+
+ See https://github.com/curl/curl/issues/4477
+
21. Next SONAME bump
21.1 http-style HEAD output for FTP