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README: clarify that `cache-hit` returns a string and not a boolean
Rationale: if cache-hit was a boolean, then ! could be used to get the opposite.
However, it is really a string, and this should be pointed out clearly in the documentation.
Because both !'true' and !'false' are false, so customers can shoot themselves in the foot here.
Closes #1262.
@bethanyj28 : Anything left to do here?