Thorsten Froehlich wrote:

> No, there is a difference between built-in variables and declared 
> variables. The former are keywords and cannot be changed by the user. 
> The later are accessible by SDL just like any other declared variable.

I thought the question was mostly about built-in variables,
according to the documentation anyway:

FLOAT_BUILT-IN_IDENT:
   clock | clock_delta | clock_on | final_clock | final_frame
   frame_number | initial_clock | initial_frame

So from the user's point of view it is strange that
clock_delta is treated differently from clock.

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