[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 = [[
--------
Returns values so that the construction
```lua
for p, c in utf8.codes(s) do
    body
end
```
will iterate over all UTF-8 characters in string s, with p being the position (in bytes) and c the code point of each character. It raises an error if it meets any invalid byte sequence.  
]]

["codes Lua 5.4"]
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).'

["codepoint Lua 5.4"]
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).'

["len Lua 5.4"]
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.'