Fix a performance regression due to logging

By switching to `#respond_to?` we make the lookup of method collisions
a lot faster while retaining the ability to report on them.

Closes #410

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/hashie/mash.rb b/lib/hashie/mash.rb
index 4008feb..b45ccce 100644
--- a/lib/hashie/mash.rb
+++ b/lib/hashie/mash.rb
@@ -145,7 +145,7 @@ module Hashie
     def custom_writer(key, value, convert = true) #:nodoc:
       key_as_symbol = (key = convert_key(key)).to_sym
 
-      log_built_in_message(key_as_symbol) if methods.include?(key_as_symbol)
+      log_built_in_message(key_as_symbol) if respond_to?(key_as_symbol)
       regular_writer(key, convert ? convert_value(value) : value)
     end