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>If i use e.g.
>global in nil
>then any code that is dofiled or something has to obey to this, or it 
>won't work. quite a mess for any Standard Libraries.
>Libraries suddenly depend on how the user wants to handle globals.

No: "global" respect scopes. dofile'd programas are not executed in the same
scope of the calling program; dofile is not include.

>or do you have to do something like this:
>global strfind,print
>global in nil

Yes. In either order, as Roberto explained.