This abstract exposes a String-like API with UTF8 support.
fromCharCode (unicode : Int) : Utf8String
read only length : Int
new (s : String) : Utf8String
charAt (pos : Int) : Utf8String
charCodeAt (pos : Int) : Int
concat (rhs : Utf8String) : Utf8String
substr (pos : Int, len : Int) : Utf8String
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