I've heard it's better to read the first edition of "Introduction to Functional Programming" by Bird & Wadler than the second edition. The first edition uses Miranda, and the second edition uses Haskell.
Is this a common recommendation? My goal is to get serious about functional programming. Thoroughly knowing the concepts of functional programming is more important to me than knowing a language's syntax, so I'm fine with learning Miranda if the first edition is somehow better.
I know F# and Scala.