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Just a single datapoint: this explanation started to lose me at "and a -> String. (In that last one, the type function is the arrow; Haskell would allow you to write it (->) a String. Also, (->)is the only type that HM specifically requires to exist.)" I don't understand what the arrow _is_, nor why HM requires it to exist. Googling didn't actually seem to help much, but that's likely because "it" has a name that I don't know.

You further lost me when you went on to write "sticking one or more "∀"s in front of a monotype". I don't know what an upside-down A is - I think I've read about these in various mathematical contexts, but I'm not sure if what I remember from those is the same as the meaning here, and the following paragraphs unfortunately didn't elucidate.

I really appreciate the effort you put into this. Hopefully someday I'll come back and be able to take those steps that I don't yet know enough to take now.