@tassilo Your concern could be addressed with a NullReader
user=> (defn NullReader []
(proxy [java.io.Reader] []
(close [] nil)
(read [a b c] -1)))
#'user/NullReader
user=> (slurp (NullReader))
""
However, this does not resolve my question because "" is not nil. Even with
a NullReader, one would have to "explicitly check for [before] hand or
handle via try/catch after the fact", like @sean said, to distinguish a
valid NullReader intent from an errant parameter.
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