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Thanks Tony

By studying your solution (it has some errors but the general
idea is correct) and the original utf8toiso from Roberto, my solution is:

local char = string.char
local function isotoutf8 (s)
   s = s:gsub("([\128-\255])", function (c)
         local b = c:byte()
         return b < 192 and "\194"..c or "\195"..char(b-64)
   return s

It is better than yours because string concatenation is a slow operation.