tyzio:
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Regarding point 2, my mistake, they are the same. Bellow correct one:

_class _create fruit {
    method eat {} {
        puts "yummy!"
    }
}
_oo::class_ create banana {
    superclass fruit
    constructor {} {
        my variable peeled
        set peeled 0
    }
    method peel {} {
        my variable peeled
        set peeled 1
        puts "skin now off"
    }
}
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It's common to have both classes declaration in one file?
I looki for my examples and found class file, where usually is Class definition
and One class per file and some library file where class used second way.

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