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TypeScript allows some unsound behavior on purpose. You can check it out at TypeScript notes about it. Also, if you want to take a look at roots of type inference in TypeScript can check TypeScript spec, but beware, it's outdated, archieved and not supported anymore
Being based on MLF which is sound, doesn't makes ReasonML fully sound in practice. Here are some examples of unsound behavior in OCaml here and here. According to this fact, we can consider that ReasonML as being the dialect of OCaml may have unsound behavior too.