Mentioned in  on Core SVN:
Query: Be better at forcing data types for query vars.
Created ticket #27231 on Core Trac:
Tweak wp-db.php so running WordPress on HHVM doesn't require hacking the ...
Created ticket #23425 on Core Trac:
PHP warning in WP_Query::get_posts() when url includes ?page
Created ticket #21300 on Core Trac:
Implement autoloader compatible with PSR-0 for plugins and themes
Created ticket #17245 on Core Trac:
WordPress fails to load if wp-load.php is not called from the global scope