Giving fucnction parameters defaults assigned values later

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In Euphoria version 4.05 a parameter default can be a variable which is only assigned a value after the function declaration. For example, the following code works when the function foo is called. 

object par_default    -- Currently no value 
-- More coding 
function foo(object mypay=par_default) 
    -- some code 
    return mypar    -- Or something more useful 
end function 
-- More coding 
par_default = 55 
-- More coding 
?foo()

Can this behaviour be relied upon in future versions? I would like to put my routines before the constants which are used for the default parameter values so that the routine is documented before the constants (using creole).

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