use different approach with refine and make sure to address nested keys

lib/livekit.rb

@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
 require "livekit/access_token"
+require "livekit/utils"
 require "livekit/grants"
 require "livekit/token_verifier"
-require "livekit/utils"
 require "livekit/version"
 
 # required since generated protobufs does use `require` instead of `require_relative`

lib/livekit/grants.rb

@@ -35,6 +35,8 @@ def to_hash
   end
 
   class VideoGrant
+    using LiveKit::Utils::StringifyKeysRefinement
+
     attr_accessor :roomCreate, :roomJoin, :roomList, :roomRecord, :roomAdmin,
       :room, :canPublish, :canPublishSources, :canSubscribe, :canPublishData,
       :canUpdateOwnMetadata, :hidden, :recorder, :ingressAdmin
@@ -88,7 +90,7 @@ def initialize(
     def self.from_hash(hash)
       return nil if hash.nil?
 
-      hash = hash.transform_keys(&:to_s)
+      hash = hash.stringify_keys
 
       VideoGrant.new(
         roomCreate: hash["roomCreate"],

lib/livekit/utils.rb

@@ -2,16 +2,25 @@
 
 module LiveKit
   module Utils
+    # Utility function to convert WebSocket URLs to HTTP URLs
     def to_http_url(url)
       if url.start_with?("ws")
-        # replace ws prefix to http
-        return url.sub(/^ws/, "http")
+        # Replace 'ws' prefix with 'http'
+        url.sub(/^ws/, "http")
       else
-        return url
+        url
       end
     end
-
     module_function :to_http_url
+
+    module StringifyKeysRefinement
+      refine Hash do
+        def stringify_keys
+          transform_keys(&:to_s).transform_values do |value|
+            value.is_a?(Hash) ? value.stringify_keys : value
+          end
+        end
+      end
+    end
   end
-end
-# convert websocket urls to http
+end