fix utf8.codes signature #696
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the iterator returned by `utf8.codes` needs some arguments (when called outside a `for` loop) ``` $ cat codes.lua local s = "foo" local iter = utf8.codes(s) print(iter(s)) print(iter(s, 1)) $ ./tl run codes.lua 1 102 2 111 $ ./tl check codes.lua ======================================== 2 errors: codes.lua:3:11: wrong number of arguments (given 1, expects 0) codes.lua:4:11: wrong number of arguments (given 2, expects 0) ```
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the iterator returned by
utf8.codesneeds some arguments (when called outside aforloop)