How to handle %2F(#\/) that is not suppose to be divider

[not-null-nil]

See this:

(list
...
     :path-info  (quri:url-decode (uri-path quri) :lenient t)
...
)

:path-info will be "/calculator/3/2" for "http://www.franz.com/calculator/3%2f2"
But what I want is ("calculator" "3/2").
See this for more info.
How do I get ("calculator" "3/2") in this case?