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The post discusses the challenge of implementing a type system in programming languages without adding significant complexity to the implementation. It proposes a 'lean' type checking approach that eliminates the need for unification variables. However, this approach has limitations in terms of inferring lambda argument types and instantiating polymorphic code. The post suggests using built-in functions with special type-checking rules as a solution.

Haskell for all: Unification-free ("keyword") type checking