object-cache.php loaded before must-use plugins

[viktorix]

I noticed that constants defined in must-use plugin were undefined if used in object-cache.php dropin plugin. Looking at wp-includes/load.php the object-cache.php check is loaded prior to must-use plugins.

I assumed must-use plugins are always loaded before all other plugins. If this is not a bug and it functions as intended, updating documentation would be helpful to note that must-use plugins are loaded after dropin plugins.
​https://codex.wordpress.org/Must_Use_Plugins#Features

Thanks!

[johnbillion]

Thanks for the report @viktorix.

This is indeed intended behaviour, as dropins control some of the low level behaviour of WordPress that loads much earlier than plugins do.

The Codex is a wiki, therefore that page can be edited by anyone with a wordpress.org user account.

[viktorix]

Thanks.