>-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:
>procedure: string-length string >Returns the number of characters in the given string. , not “return the number of bytes”. Without mentioning the encoding, the “number of bytes” would be ill-defined anyways. Best regards, Maxime Devos.