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-0.0 treated as negative?

From: Bill Schottstaedt
Subject: -0.0 treated as negative?
Date: Mon, 7 Jun 2010 07:00:42 -0700 
I just noticed a case where -0.0 is apparently negative:

scheme@(guile-user)> (/ 1.0 0.0)
+inf.0
scheme@(guile-user)> (/ -1.0 0.0)
-inf.0
scheme@(guile-user)> (/ 1.0 -0.0)   
-inf.0
scheme@(guile-user)> (/ -1.0 -0.0)
+inf.0
scheme@(guile-user)> (negative? -0.0)
#f

And here's a separate oddity:

scheme@(guile-user)> (expt #t 0)
1
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