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Making variables = nil indirectly

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Is there anyway to actually make a variable nil indirectly without
having to do the usual 'variable name = nil' in LUA? 
For example I have a variable called MyObject which I instantiate in a
table, later in the code I wish to destroy all
references to it so I may use something like the following
MyObject = {}
...
MyObject is created and setup + instantiated and filled in with params C
side..
...
function DestroyObject( a )
	a:Destroy()
	a = nil
end;
DestroyObject( MyObject )
Its destroy function is called, but it does not make MyObject nil?
If I do the following
MyObject:Destroy()
MyObject = nil
Everything works fine...
So 2 questions
1) Is it possible to call a function in lua and pass in a reference to
an object and set that object to nil like above?
2) Is it possible to make MyObject = nil from C, I have tried setting
MyObject to nill using pushnil etc and removing all references in tables
to this object but it still remains in lua..
Regards

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