I see '##flonum?' in the source of the Calculator application in LambdaNative.
What is the difference between 'flonum?' and '##flonum?' in Gambit Scheme?
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The "##" denotes a special namespace - the "internal" code as opposed to user code. So "##flonum?" is an internally-defined function as opposed to "flonum?". One may be more performant than the other.
See http://dynamo.iro.umontreal.ca/wiki/index.php/Namespaces. That page also mentions that this mechanism is not described in official documentation. The Gambit-C v4.7.9 reference has "To Do" in the namespace section.