add warning for over-long dotted decimal

diff --git a/helpers/bump-version b/helpers/bump-version
index b474e3f..d9ae2ae 100755 (executable)
--- a/helpers/bump-version
+++ b/helpers/bump-version
@@ -188,6 +188,9 @@ sub bump_version {
       $parts[$bump_this]++;
       $_ += 0
         for @parts;
+      if (grep $_ > 999, @parts[1 .. $#parts]) {
+        warn "$new_decimal has a version component greater than 999.  It will be incompatible with some uses in perl.\n";
+      }
       $new_decimal = $new_vstring = $v . join '.', @parts;
     }
     else {