Updated type tests for [Ordered]Set.fromKeys #1968
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This change updates the tests to report that the actual type inferred by tsc is correct. It would be easy to make the existing tests pass by changing the order of the overloadings in immutable.d.ts, but in this case I believe tsc is doing the right thing: it can't automatically infer the correct type of the values returned by
fromKeys
, so it's better to infer the type asunknown
.