id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
9212	check layer value for illegal values	RicoZ	team	"People seem to be rather creative:

http://taginfo.openstreetmap.org/keys/?key=layer#values

*legal values (according to wiki) -5,..-1,0,1..5
*warning for <-5 or >5
*warning for ""+1"" instead of ""1"", leave or auto-fix? Was surprised that it stays in the data verbatim but might not be bad if people would stick to uniform notation..
*ERROR for ""Jalan Perkebunan Sawit""
"	enhancement	closed	normal		Core validator		duplicate		RicoZ