Commits on Sep 9, 2023

1. fix utf8.codes signature …

   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)
   ```

   

   fperrad committed Sep 9, 2023
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