should pure functions accept/deal with shared data?

[dennis luehring]

>>> >>We clearly agree completely; this is exactly what I'm saying in the paragraph you
>>> >>quoted below. What i'm*also*  saying is that the 'incorrectness' of it is harmless
>>> >>in practice - so I'm not sure that it should be forbidden, and handled specially
>>> >>(which would be necessary in the inferred-purity cases).

but it makes no sense to cripple an feature like pure half-way - pure is 
clean and well defined (still not perfect) - but you talking about 
making it very stupid and sensless "'incorrectness' of it is harmless
in practice" ... "Yes, they can be used incorrectly, but I'd expect 
anybody working with shared to know what they're doing" - no they don't 
- sorry, haven't you any real experience in the threading world or why 
don't you see the problems introdcing shared in pure