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    $\begingroup$ Using TracePrint[] on your third input in your last bit is rather telling... for that matter, try TracePrint[f[n_Integer]] after your second input and watch the growth from f[n_Integer] to f[{}, n_Integer] to f[{}, {}, n_Integer] to... $\endgroup$ Commented Jan 19, 2012 at 18:00
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    $\begingroup$ On the other hand, if you use f[x__Real] := {x} (i.e. BlankSequence instead of BlankNullSequence), you don't bump into the problem. $\endgroup$ Commented Jan 19, 2012 at 18:08
  • $\begingroup$ N.B. One doesn't need to do a kernel restart when trying out each code blob. Just precede each code blob with Remove[f, g] for a clean evaluation. $\endgroup$ Commented Jan 19, 2012 at 18:11
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    $\begingroup$ If you're going to play around with TracePrint[], you probably would want to lower your value of $IterationLimit to a small integer, say 20. For instance: Block[{$IterationLimit = 20}, TracePrint[f[n_Integer]]]. $\endgroup$ Commented Jan 19, 2012 at 18:14
  • $\begingroup$ @J.M.: Actually for my tests I used "Notebook's Default Context → Unique to Each Cell Group" and just started a new section for each test. $\endgroup$ Commented Jan 19, 2012 at 18:17