(alist-refnum alist key fbnum)

Returns the numeric value associated with the given key, or the fallback if not found

Parameter	Description
alist	association list
key	list key to lookup
fbnum	fallback number

Example

> (define a '((1 "2")(3 4)))
> (alist-ref a 1)
"2"
> (alist-ref a 4 'undefined)
undefined
> (alist-refstr a 3 "")
"4"
> (alist-refnum a 1 0)
2
> (set! a (alist-set a 1 "replaced" 5 'new))
> (alist-ref a 1)
"replaced"
> (set! a (alist-delkeys a 1 3))
> (alist-ref a 1)
#f