What is the rationale for digit-value ? Its usefullness seems limited. It
could be used to parse decimal numbers and convert them to their numerical
value. However, a more general procedure would be useful to parse numbers in
any base:
(digit-value #\A) ==> 10
It could be defined for the "digits" 0-9, and a-z (i.e. up to base 36).
Marc
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