Index: trunk/data/validator/numeric.mapcss
===================================================================
--- trunk/data/validator/numeric.mapcss	(revision 6532)
+++ trunk/data/validator/numeric.mapcss	(revision 6534)
@@ -3,4 +3,5 @@
 *[layer =~ /\+.*/] {
   throwWarning: tr("layer tag with + sign");
+  fixAdd: concat("layer=", replace(tag("layer"), "+", ""));
   assertMatch: "node layer=+1";
   assertNoMatch: "node layer=1";