return error for non-comparable key in get builtin#972
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Noticed get indexes a map with reflect.Value.MapIndex(reflect.ValueOf(i)) but never checks the key is comparable. When the map key type is dynamic, e.g. groupBy returns map[any][]any, a slice key passes the checker and hits a raw "hash of unhashable type" panic at runtime, so get(groupBy([1,2,3], # % 2), [1]) blows up. Since get returns errors directly, return a clean "not comparable" error before the lookup, same as the groupBy fix.