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Re:Announcing TypeScript 2.2 by DanRosenwasser on Wednesday February 22, 2017 @08:55PM (#13711005)
TypeScript's full error message on that last one is actually

  Type 'Boolean' is not assignable to type 'boolean'.
    'boolean' is a primitive, but 'Boolean' is a wrapper object. Prefer using 'boolean' when possible.

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