[tel]

> Not widely used...

I use them in every single application I write, or I make my own tighter, more specific ones. They're incredibly useful in real world apps.

[sordina]

Sorry Tel, I didn't mean to imply that nobody uses them, more that I would guess that they are used less than 1% of the time where their inclusion could be beneficial.

[tel]

Ha, no offense. I just wanted to emphasize that they are used.

In particular, I think they're more useful in applications than libraries and most Haskell code you can find in the wild is library code---so you end up not seeing them much.