| From: Matthias Felleisen (matthias at ccs.neu.edu) Date: Sat Mar 28 09:26:07 EDT 2009 |
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On Mar 28, 2009, at 8:41 AM, Dave Herman wrote: > Because Scheme is untyped, it's not possible for hash-ref to return > one standard "not found" value, so the API ought to provide a > predicate. Because Typed Scheme is typed, it's not possible for hash-ref to use one standard "not found" type, so the API ought to provide the return type.
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