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Testing and POD, but still useful (Score:1)
The other reason is that if I stick it in a seperate file then I can document it with POD. I can't do that in the middle of some other class (and even at the end it looks wrong)
OTOH, sometimes you don't need to document something in the POD - I wouldn't enforce you to document every private method (you might want to hide the interface) and therefore I shouldn't force you to document it just because it's in a different namespace.
Infact, the only module I've ever uploaded to CPAN uses an 'inner class'. I needed a tied filehandle to capture the output of Test::Builder. No-one cares that I'm using it - it doesn't effect your code - so it's not mentioned in the POD. And I can't test it alone!
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