id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13877	Warn about waterway=canal as areas	naoliv	team	"I saw some closed areas tagged as `waterway = canal`
https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dcanal says that it's a linear feature only (ie, we should not use it on areas)

If I did the right math, we have 2243 canals as areas in OSM

Is it a worth test?
{{{
#!mapcss
area:closed[waterway = canal] {
        throwWarning: tr(""{0} should not be used on areas"", ""{1.tag}"");
        suggestAlternative: ""width"";
        suggestAlternative: ""waterway=riverbank"";
}
}}}"	enhancement	closed	normal	16.12	Core validator		fixed	waterway canal