Internal record cache can be modified

Moodle config settings:

cachetype: internal
rcache: true

The test (I added this block to the top of index.php):

// Get course, print name, change name
$course = get_record('course', 'id', SITEID);
notify($course->fullname); // Prints: TESTING SITE
$course->fullname = 'newname';

// Get course again, print name
$course = get_record('course', 'id', SITEID);
notify($course->fullname); // Prints: newname
die;

From the above, the first time we get the course, we modify it, which in turn modifies the object in the cache. The cache should return a clone of the object stored in the cache to prevent this from happening.

This doesn't seem to be a problem with the other caching types, but I wasn't able to test eaccelerator.