''[[TODO: describe; rename the command to something more tclish?]]''
Consequence of [NRE].

[Lars H]: A thought: how is this different from what can be had through the age-old technique of creating a dummy local variable and putting an unset [trace] on it?
Basic implementation:
 proc atProcExit {script} {
    upvar 1 atProcExistScripts arr
    set arr($script) {}
    trace add variable arr($script) unset "$script\n\#"
 }

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