Bleh. POSIX::floor() on a Perl that uses "long double" (or similar) as NVs induces a great reduction in precision. Much better to just use:
sub floor { $_[0] < 0 ? -int(-$_[0]) : int($_[0]); }
sub floor { my $i= int( my $f= shift @_ ); return $i - ( $f<0 && $f!=$
+i ); }
Now you know. :)
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