[APN] Notes on what I have learnt about TclOO method dispatching - see [http://woof.magicsplat.com/blogs/tcloo_method_dispatch]

[DKF]: In terms of implementation, a few extra notes. There is an internal function called `TclOOGetCallContext` that returns a call-chain handle for a method, constructor or destructor, and which is called when you invoke the method. The call chain is then fixed for the life of the invocation of of the method; `TclOOInvokeContext` (the other major function in this area) then just walks the chain. TOGCC uses caches heavily, at all of the the object, class and [Tcl_Obj] method name levels.

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