compared with
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||handler||callback input||callback output||
|write|arguments + unicode integer (code point or member of surrogate pair) + UTF-8 (unescaped) UTF-8 character|string of the escaped value| UTF-8 character|
|read|arguments + pattern matches|unicode integer value (code point or member of surrogate pair)|
|before-write|arguments + unescaped string|unescape-safe string|
|after-read|arguments + unescape-safe string|unescaped string|