TypeScript's full error message on that last one is actually Type 'Boolean' is n...

		DanRosenwasser on Feb 23, 2017 \| parent \| context \| favorite \| on: Announcing TypeScript 2.2 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.`