feat: compare index by cache_key

index_record.index == Config::Index([:remap, :LEFTSHIFT])

lib/fusuma/config/index.rb

@@ -14,7 +14,7 @@ def initialize(keys)
             key = Key.new(key) if !key.is_a? Key
             @keys << key
             key.symbol
-          end.join(",")
+          end.join(",").to_sym
         else
           key = Key.new(keys)
           @cache_key = key.symbol
@@ -26,6 +26,12 @@ def to_s
         @keys.map(&:inspect)
       end
 
+      def ==(other)
+        return false unless other.is_a? Index
+
+        cache_key == other.cache_key
+      end
+
       attr_reader :keys, :cache_key
 
       # Keys in Index