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gettable hook

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If I place a hook on "index" for strings like this:
function gettableHook(object, field)
 print("called gettableHook")
end
settagmethod( tag(""), "gettable", gettableHook)
and then do:
 a = "foo"
 a.test
The gettableHook is called properly.
But if I do:
 "foo".test
I get a syntax error. 
Is there any way to get both to work the same?
Steve

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