What is the most straightforward way to make a variable in the global scope 
that can change it's value, but not its type? So far I use this: 

const GLOBAL_VAR = [MyType[]]  # array with single element

set_global_var(x::MyType) = GLOBAL_VAR[1] = x
get_goval_var() = GLOBAL_VAR[1]

This works fine and preserves type stability, but looks quite unintuitive. 
Is there more standard container or another way (e.g. type assertions or 
something) to handle such cases? 

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