Whilst autoloading is known to be not threadsafe, leaving it in place
is a softer solution than failing hard when an application is deployed.
Many older applications will have paths added to `autoload_paths` and
ideally these should be eagerly loaded to be threadsafe. However one
of these paths is quite often lib which could lead to unintended
consequences due to the 'junk drawer' nature of this directory.
Developers should refrain from adding paths to `autoload_paths` or
`eager_load_paths` and use custom folders inside app for code that
needs to be eagerly loaded and use `require` or `require_dependency`
to explicitly load code from other locations.