compare:
'I've done no work today whatsoever!'

If someone said this to me, I would assume that they meant they had done very little work, not that they had not actually done any work at all
( Spoon, Tue 17 Dec 2002, 18:10, archived)

dunno i
reckon i'd believe em. certainly when i say that i mean literally no work whatsoever, but then i'm probably more of a layabout than your mates, so it's a fair cop.

:)
( slight yoinks!, Tue 17 Dec 2002, 18:25, archived)