Multifile hook that can be used to extend the set of character codes
that is recognised as likely text. By default, is_text_code/1 fails
everywhere and internally, only non-control ASCII characters
(32-126) and the the control codes (9,10,13) are accepted.
To be done
- we might be able to use the current locale to include the
appropriate code page. (Does that really make sense?)
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