* [#146](https://github.com/intridea/hashie/issues/146): Mash#respond_to? inconsistent with #method_missing and does not respond to #permitted? - [@dblock](https://github.com/dblock).
* [#89](https://github.com/intridea/hashie/issues/89): Added Hashie::Extensions::Mash::ActiveModel for compatibility with Rails 4.x Strong Parameters - [@dblock](https://github.com/dblock).
* [#152](https://github.com/intridea/hashie/pull/152): Do not convert keys to String in Hashie::Dash and Hashie::Trash - [@dblock](https://github.com/dblock).
* [#152](https://github.com/intridea/hashie/pull/152): Do not automatically stringify keys in Hashie::Hash#to_hash, pass `:stringify_keys` - [@dblock](https://github.com/dblock).
* [#138](https://github.com/intridea/hashie/pull/138): Added Hashie#Rash, a hash whose keys can be regular expressions or ranges - [@epitron](https://github.com/epitron).
* [#131](https://github.com/intridea/hashie/pull/131): Added IgnoreUndeclared, an extension to silently ignore undeclared properties at intialization - [@righi](https://github.com/righi).
* [#107](https://github.com/intridea/hashie/pull/107): Fixed excessive value conversions, poor performance of deep merge in Hashie::Mash - [@davemitchell](https://github.com/dblock), [@dblock](https://github.com/dblock).
* [#103](https://github.com/intridea/hashie/pull/103): Fixed support for Hashie::Dash properties that end in bang - [@thedavemarshall](https://github.com/thedavemarshall).
* [89](https://github.com/intridea/hashie/issues/89): Do not respond to every method with suffix in Hashie::Mash, fixes Rails strong_parameters - [@Maxim-Filimonov](https://github.com/Maxim-Filimonov).
* [#110](https://github.com/intridea/hashie/pull/110): Correctly use Hash#default from Mash#method_missing - [@ryansouza](https://github.com/ryansouza).
* [#96](https://github.com/intridea/hashie/pull/96): Make coercion work better with non-symbol keys in Hashie::Mash - [@wapcaplet](https://github.com/wapcaplet).