> does, which I *really* like because I really dislike dealing with XTALs 
> for proto work, since keeping an XTAL running on a breadboard
> sometimes can be a unique and educational experience

Can't say I've ever had major problems breadboarding but if you're
that worried about it use a can. Surely you can't / shouldn't restrict
yourself to the internal oscillator ? It might be convenient and cheap
but it has its drawbacks too

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