>>  >-Returns the number of characters in the given @var{string}.

>> +Returns the number of bytes in the given @var{string}.

>> 

>> This is false. For example, (string-length "😀") is 1, whereas in all encodings I know of it is >more than one byte. Also, R5RS says: [...]

>

>Maybe `the number of codepoints` will work here.

>

>(string-length "👨🏭") ;; => 3

>(string-length "é") ;; => 2

>

>The number of characters here is 1 in both cases.

No, in Unicode (and Guile equates character=Unicode character) all characters correspond to a single codepoint.

You need to fix your setup, that’s not what Guile does. Are you sure you have set the encoding of current-input-port correctly? (Probably by setting LC_ALL or the like to a UTF-8 locale.) Otherwise the 3 bytes in the UTF-8 encoding might be interpreted in terms of some 8-bit encoding.

Here’s a test: if you can input #\👨🏭 without errors and it evaluates to #\👨🏭, then the encoding should be set up correctly.

Best regards,

Maxime Devos