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Issue #2693315 by dalin: "Call to undefined function apcu_fetch() in ApcuQueuedCachedClassLoader" if Self-updating APCu classmap is chosen but unavialable
Issue #2681577 by dmitry.kazberovich: Fatal "Serialization of Closure is not allowed"
Move faster self-updating classmap cache types to the top.
Comment on performance of is_file().
UI: Add explanations about self-updating classmaps.
Introduce new cache type 'apcu_q'.
Rename 'Smart database cache' to 'Self-updating database classmap'.
Replace 'xautoload_libraries_info' string literal with a constant.
Delete variable 'xautoload_cache_prefix' on uninstall.
Introduce constants for variable_get() keys.
Delete variable 'xautoload_cache_types' on uninstall.
Use __DIR__ instead of dirname(__FILE__), because xautoload now depends on PHP 5.3 min.
Comment in DrupalCoreRegistryPlugin why guessFile() instead of claimFile().
Delete variable xautoload_cache_lazy on uninstall.
Option to replace core autoloader.
Code style: New line after last method.
Add two @see comments.
Improve descriptions on xautoload performance settings.
See issue #2451261 by SocialNicheGuru, 'What does option "Smart database cache" mean?'
Issue #2473901 by tom.gillett: Compatibility with Libraries API 'vendor path'
Issue #2415733 by plopesc, donquixote: XAutoload fails to load classes on update.php page
Issue #2393205 by xtfer, donquixote, thijsvdanker: Base table or view not found: 1146 Table 'system' doesn't exist when used in Profile
Add @see comments in XAutoloadUnitTestCase, that illustrate where expected autoload callbacks are registered in core.
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