char-external-codereturns a non-negative integer that is the index of the specified character within the specified character set.
char-external-code-limit returns the upper exclusive bound of the value of
char-external-code for the specified character set.
find-external-char returns a character object that is the character encoded at the specified character index within the specified character set.
These functions allow you to determine the external code of a character, which might differ from Lisp's internal encoding of the character.
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