[char]
description = 'Receives zero or more integers, converts each one to its corresponding UTF-8 byte sequence and returns a string with the concatenation of all these sequences.'

[charpattern]
description = 'The pattern which matches exactly one UTF-8 byte sequence, assuming that the subject is a valid UTF-8 string.'

[codes]
description = [[
--------
```lua
for p, c in utf8.codes(s) do
    body
end
```
]]

[codepoint]
description = 'Returns the codepoints (as integers) from all characters in `s` that start between byte position `i` and `j` (both included).'

[len]
description = 'Returns the number of UTF-8 characters in string `s` that start between positions `i` and `j` (both inclusive).'

[offset]
description = 'Returns the position (in bytes) where the encoding of the `n`-th character of `s` (counting from position `i`) starts.'