(expt 0 3) => 1 but should yield 0

[Eric Hanchrow]

This is guile 1.6.0

$ /usr/local/guile1.6/bin/guile -q -c '(begin (display (expt 0 3)) (newline))'
1

But other schemes (not to mention my dim recollection of mathematics)
disagree:

$ /usr/bin/guile --version
Guile 1.4

$ /usr/bin/guile -q -c '(begin (display (expt 0 3)) (newline))'
0

$ scheme -eval '(begin (display (expt 0 3)) (newline) (exit))' 2>/dev/null
...
MIT Scheme running under GNU/Linux
...
  Release 7.7.0
...
0

$ scsh -c '(begin (display (expt 0 3)) (newline) (exit))'
0

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