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---@class utf8
utf8 = {}
---@param code integer
---@vararg integer
---@return string
function utf8.char(code, ...) end
utf8.charpattern = '[\0-\x7F\xC2-\xF4][\x80-\xBF]*'
---@param s string
---@param lax boolean?
---@return fun():integer, integer
function utf8.codes(s, lax) end
---@param s string
---@param i integer?
---@param j integer?
---@param lax boolean?
---@return integer code
---@return ...
function utf8.codepoint(s, i, j, lax) end
---@param s string
---@param i integer?
---@param j integer?
---@param lax boolean?
---@return integer?
---@return integer errpos?
function utf8.len(s, i, j, lax) end
---@param s string
---@param n integer
---@param i integer
---@return integer p
function utf8.offset(s, n, i) end
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