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Is that a jab at Haskell in the very first paragraph?

> Today [Go] sits at position 12 on the Tiobe Programming

> Language Index (Haskell sits at position 41).

One of the authors, Philip Wadler, contributed heavily to the design of Haskell. So I presume it's friendly joking.

Authors wants to bring types to where people are. Simply justifying their work.