Hash Set

Creates a new hash set. For example:

(define hs (hash-set:make equal-hash-mod equal?))
;Value: hs

(hash-set:add! hs "hello")
;Unspecified return value

(hash-set:add! hs "world")
;Unspecified return value

(hash-set:contains? hs "hello")
;Value 3856: "hello"

(hash-set:contains? hs "world")
;Value 3857: "world"

(hash-set:contains? hs "oops")
;Value: #f

Adds a new object to the hash-set. If the object is already present, it will be re-inserted without creating a duplicate.