[rubygems/rubygems] Allow to use String keys some of configuration

https://github.com/rubygems/rubygems/commit/ee0bef2786

lib/rubygems/config_file.rb

@@ -210,6 +210,17 @@ class Gem::ConfigFile
       @hash = @hash.merge environment_config
     end
 
+    @hash.transform_keys! do |k|
+      # gemhome and gempath are not working with symbol keys
+      if %w[backtrace bulk_threshold verbose update_sources cert_expiration_length_days
+            install_extension_in_lib ipv4_fallback_enabled sources disable_default_gem_server
+            ssl_verify_mode ssl_ca_cert ssl_client_cert].include?(k)
+        k.to_sym
+      else
+        k
+      end
+    end
+
     # HACK: these override command-line args, which is bad
     @backtrace                   = @hash[:backtrace]                   if @hash.key? :backtrace
     @bulk_threshold              = @hash[:bulk_threshold]              if @hash.key? :bulk_threshold

test/rubygems/test_gem_config_file.rb

@@ -487,6 +487,16 @@ if you believe they were disclosed to a third party.
     end
   end
 
+  def test_accept_string_key
+    File.open @temp_conf, "w" do |fp|
+      fp.puts "verbose: false"
+    end
+
+    util_config_file
+
+    assert_equal false, @cfg.verbose
+  end
+
   def test_load_ssl_verify_mode_from_config
     File.open @temp_conf, "w" do |fp|
       fp.puts ":ssl_verify_mode: 1"