Hello, On Tue, Dec 25, 2012 at 3:39 PM, Daniel Fischer < daniel.is.fischer@googlemail.com> wrote:
Defining TvShow with strict fields for title, startTime and summary makes sure these fields are evaluated (to WHNF, but in case of `Data.Text`, that means fully evaluated) **when the TvShow value is evaluated to WHNF**.
how do I know what does "evaluated to WHNF" means for every possible type? For instance, what does that mean for "String"? What does that mean for "Maybe String"? If I want the field to be fully evaluated, is !(Maybe String) enough or should I even do !(Maybe !String) or something more? Any source of information where I can read about this in depth would be welcome (I have yet to read Real World Haskell, maybe it's covered there?). Thank you! Emmanuel