Handle boolean filters when set on as default

lib/biomart/dataset.rb

@@ -251,9 +251,9 @@ def dataset_xml( xml, dataset, args )
               raise Biomart::ArgumentError, "The filter '#{name}' does not exist" if dataset.filters[name].nil?
 
               if dataset.filters[name].type == 'boolean'
-                if [true,'included','only'].include?(value)
+                if [true,'included','only'].include?(value.downcase)
                   xml.Filter( :name => name, :excluded => '0' )
-                elsif [false,'excluded'].include?(value)
+                elsif [false,'excluded'].include?(value.downcase)
                   xml.Filter( :name => name, :excluded => '1' )
                 else
                   raise Biomart::ArgumentError, "The boolean filter '#{name}' can only accept 'true/included/only' or 'false/excluded' arguments."
@@ -266,7 +266,11 @@ def dataset_xml( xml, dataset, args )
           else
             dataset.filters.each do |name,filter|
               if filter.default?
-                xml.Filter( :name => name, :value => filter.default_value )
+                if filter.type == 'boolean'
+                  xml.Filter( :name => name, :excluded => filter.default_value )
+                else
+                  xml.Filter( :name => name, :value => filter.default_value )
+                end
               end
             end
           end