Array of relative source paths excluded according to the source.exclude key of the ini

Property definitions

nitc :: loader $ MPackage :: _excludes
	# Array of relative source paths excluded according to the `source.exclude` key of the `ini`
	var excludes: nullable Array[String] is lazy do
		var ini = self.ini
		if ini == null then return null
		var exclude = ini["source.exclude"]
		if exclude == null then return null
		var excludes = exclude.split(":")
		return excludes
	end
src/loader.nit:1183,2--1191,4