Fix UserFileDefaultOptions#fetch to properly consume default value

History.md

@@ -38,6 +38,7 @@
   * Fixed a few minor concurrency bugs in ThreadPool that may have affected non-GVL Rubies (#2220)
   * Fix `out_of_band` hook never executed if the number of worker threads is > 1 (#2177)
   * Fix ThreadPool#shutdown timeout accuracy (#2221)
+  * Fix `UserFileDefaultOptions#fetch` to properly use `default` (#2233)
 
 * Refactor
   * Remove unused loader argument from Plugin initializer (#2095)

lib/puma/configuration.rb

@@ -54,17 +54,19 @@ def initialize(user_options, default_options)
     attr_reader :user_options, :file_options, :default_options
 
     def [](key)
-      return user_options[key]    if user_options.key?(key)
-      return file_options[key]    if file_options.key?(key)
-      return default_options[key] if default_options.key?(key)
+      fetch(key)
     end
 
     def []=(key, value)
       user_options[key] = value
     end
 
     def fetch(key, default_value = nil)
-      self[key] || default_value
+      return user_options[key]    if user_options.key?(key)
+      return file_options[key]    if file_options.key?(key)
+      return default_options[key] if default_options.key?(key)
+
+      default_value
     end
 
     def all_of(key)