that `require('foo')` will always return the exact same object, if it
would resolve to different files.
+Additionally, on case-insensitive file systems or operating systems, different
+resolved filenames can point to the same file, but the cache will still treat
+them as different modules and will reload the file multiple times. For example,
+`require('./foo')` and `require('./FOO')` return two different objects,
+irrespective of whether or not `./foo` and `./FOO` are the same file.
+
## Core Modules
<!--type=misc-->