-between two IPv4 addresses is the same range, but signed.) Therefore,
-the distance between two addresses should be calculated using the
-C<bigint> method ($addr2->bigint - $addr1->bigint), which returns the
-address as a L<Math::BigInt> object, and also conveniently discards the
-netmask.
+between two IPv4 addresses is the same range, but signed.) In later versions
+of the library the C<bigint> method can be used as a workaround, but
+otherwise it's not safe to subtract two addresses that might differ in the
+first bit of the first octet.