Fix typeOf(nil) panic and give keys() a clear error on non-map values - #370
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typeOf(nil)dereferenced the nil reflect.Type and panicked — an uncaught crash when running with Options.Debug. It now returns "nil", matchingkindOf(nil).keys()on a non-map leaked a raw reflect panic ("reflect: call of reflect.Value.MapKeys on int64 Value"); it now reports "keys expected map type, got int64".Adds the first tests for the core package.