middleclass changelog

Version 4.1.1

Fixed a bug in which static values which evaluated to false were not available in subclasses (#51, thanks @qaisjp for the patch!)
isInstanceOf does not throw an error any more when its first parameter is a primitive (#55) (This effectively undoes the change introduced in 4.1.0)

Simplifies implementation of isInstanceOf and isSubclassOf. They will now raise an error if their first parameter (the self) isn't an instance or a class respectively.

Unified the method and metamethod lookup into a single algorithm
Added the capacity of setting up the __index metamethod in classes
Removed global Object (classes created with class(<name>) have no superclass now)
Removed default method Class:implements(<mixin>)
Renamed several internal functions

Changed the way metamethods were handled to fix certain bugs (un-stubbed metamethods could not be inherited)

Added Lua 5.3 metamethod support (__band, __bor, __bxor, __shl, __bnot)

Anything that behaves reasonably like a class can be a class (no internal list of classes)
The class global function is now just the return value of require 'middleclass'. It is a callable table, but works exactly as before.
The global variable Object becomes class.Object
The global function instanceOf becomes class.Object.isInstanceOf. Parameter order is reversed.
The global function subclassOf becomes class.Object.static.isSubclassOf. Parameter order is reversed.
The global function implements becomes class.Object.static.implements. Parameter order is reversed.
Specs have been translated from telescope to busted