1 files changed, 15 insertions, 2 deletions
diff --git a/contrib/perl5/lib/integer.pm b/contrib/perl5/lib/integer.pm
index 894931896fc2..86afcaf130db 100644
--- a/contrib/perl5/lib/integer.pm
+++ b/contrib/perl5/lib/integer.pm
@@ -28,16 +28,29 @@ code
 you'll be left with C<$x == 1.5>, C<$y == 2> and C<$z == -1>.  The $z
 case happens because unary C<-> counts as an operation.
 
+Native integer arithmetic (as provided by your C compiler) is used.
+This means that Perl's own semantics for arithmetic operations may
+not be preserved.  One common source of trouble is the modulus of
+negative numbers, which Perl does one way, but your hardware may do
+another.
+
+  % perl -le 'print (4 % -3)'
+  -2
+  % perl -Minteger -le 'print (4 % -3)'
+  1
+
 See L<perlmod/Pragmatic Modules>.
 
 =cut
 
+$integer::hint_bits = 0x1;
+
 sub import {
-    $^H |= 1;
+    $^H |= $integer::hint_bits;
 }
 
 sub unimport {
-    $^H &= ~1;
+    $^H &= ~$integer::hint_bits;
 }
 
 1;