[Haskell-cafe] programming style...and type classes...

[Nicholls, Mark]

im writing a msc project which touches on typeclasses (i am a relative noob at haskell, im using it in comparison to other techniques)

i believe there is advice to avoid typeclasses stylistically? (see haskell wiki on style, allegedly because it leads to creeping haskell extensions...overlapping instances etc)...which lead you into the "wild" (allegedly SPJ)

is there some sort of potted pros vs cons? its such a general question its actually hard to find something specific.

or is it simply that? 
some cases overlap and some cases are undecidable, throw in functional dependency and type families and you're in a world of complexity you may not need?

vs

extensibility
?

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