* [#536](https://github.com/hashie/hashie/pull/536): Added exporting a normal Hash from an indifferent one through the `#to_hash` method - [@michaelherold](https://github.com/michaelherold).
* [#521](https://github.com/hashie/hashie/pull/499): Do not convert keys that cannot be represented as symbols to `String` in `Mash` initialization - [@carolineartz](https://github.com/carolineartz).
* [#525](https://github.com/hashie/hashie/pull/525): Use `indifferent_writer` in `IndifferentAccess#convert!` - [@yogeshjain999](https://github.com/yogeshjain999).
* [#538](https://github.com/hashie/hashie/pull/538): Dropped testing for JRuby 9.0, though not support - [@michaelherold](https://github.com/michaelherold).
* [#516](https://github.com/hashie/hashie/issues/516): Fixed `NoMethodError` raised when including `Hashie::Extensions::Mash::SymbolizeKeys` and `Hashie::Extensions::SymbolizeKeys` in mashes/hashes with non string or symbol keys - [@carolineartz](https://github.com/carolineartz).
* [#531](https://github.com/hashie/hashie/pull/531): Fixed [slice doesn't work using symbols](https://github.com/hashie/hashie/issues/529) using hash with `IndifferentAccess` extension - [@gnomex](https://github.com/gnomex).
* [#535](https://github.com/hashie/hashie/pull/535): Restored the exporting of all properties as part of `Dash#to_h` and `Dash#to_hash` - [@michaelherold](https://github.com/michaelherold).
* [#537](https://github.com/hashie/hashie/pull/537): Fixed inconsistencies with handling defaults in `Dash` with and without `IgnoreUnclared` mixed in - [@michaelherold](https://github.com/michaelherold).
* [#547](https://github.com/hashie/hashie/pull/547): Fixed issue where a source hash key can be used in translating multiple properties - [@danwa5](https://github.com/danwa5).
* [#545](https://github.com/hashie/hashie/pull/545): Add `Hashie::Mash#except` and `Hashie::Extensions::IndifferentAccess#except` when running under Ruby 3 to match newly added Ruby stdlib method - [@jackjennings](https://github.com/jackjennings).
* [#499](https://github.com/hashie/hashie/pull/499): Add `Hashie::Extensions::Mash::PermissiveRespondTo` to make specific subclasses of Mash fully respond to messages for use with `SimpleDelegator` - [@michaelherold](https://github.com/michaelherold).
* [#498](https://github.com/hashie/hashie/pull/498): Exclude tests from the gem release to reduce installation size and improve installation speed - [@michaelherold](https://github.com/michaelherold).
* [#505](https://github.com/hashie/hashie/pull/505): Ensure that `Hashie::Array`s are not deconverted within `Hashie::Mash`es to make `Mash#dig` work properly - [@michaelherold](https://github.com/michaelherold).
* [#508](https://github.com/hashie/hashie/pull/508): Fixed `Hashie::Extensions::DeepMerge``#deep_merge` not correctly dup'ing sub-hashes if active_support hash extensions were not present - [@bobbymcwho](https://github.com/bobbymcwho).
* [#500](https://github.com/hashie/hashie/pull/500): Do not warn when setting Mash keys that look like underbang, bang, and query methods - [@michaelherold](https://github.com/michaelherold).
* [#510](https://github.com/hashie/hashie/pull/510): Ensure that `Hashie::Mash#compact` is only defined on Ruby version >= 2.4.0 - [@bobbymcwho](https://github.com/bobbymcwho).
* [#474](https://github.com/hashie/hashie/pull/474): Expose `YAML#safe_load` options in `Mash#load` - [@riouruma](https://github.com/riouruma), [@dblock](https://github.com/dblock).
* [#478](https://github.com/hashie/hashie/pull/478): Added optional array parameter to `Hashie::Mash.disable_warnings` - [@bobbymcwho](https://github.com/bobbymcwho).
* [#481](https://github.com/hashie/hashie/pull/481): Ruby 2.6 - Support `Hash#merge` and `#merge!` called with multiple Hashes/Mashes - [@bobbymcwho](https://github.com/bobbymcwho).
* [#488](https://github.com/hashie/hashie/pull/488): Added ability to create an anonymous `Hashie::Mash` subclass with key conflict errors silenced using `Hashie::Mash.quiet.new` - [@bobbymcwho](https://github.com/bobbymcwho).
* [#482](https://github.com/hashie/hashie/pull/482): Update Travis configs to make jruby builds run on trusty dist - [@BobbyMcWho](https://github.com/BobbyMcWho).
* [#459](https://github.com/hashie/hashie/pull/459): Fixed a regression in `Mash.load` that disallowed aliases - [@arekt](https://github.com/arekt) and [@michaelherold](https://github.com/michaelherold).
* [#465](https://github.com/hashie/hashie/pull/465): Fixed `deep_update` to call any readers when a key exists - [@laertispappas](https://github.com/laertispappas).
* [#479](https://github.com/hashie/hashie/pull/479): Fixed an issue with `Hash#except` not returning a `Mash` in Rails 6 - [@bobbymcwho](https://github.com/bobbymcwho).
* [#489](https://github.com/hashie/hashie/pull/489): Updated the documentation to exlain the behavior of `Mash` and keyword arguments - [@Bhacaz](https://github.com/Bhacaz).
* [#465](https://github.com/hashie/hashie/pull/465): Clean up our RuboCop configuration and fix the outstanding line length violations. This involved some minor refactoring on `Hashie::Extensions::Coercion`, `Hashie::Extensions::Dash::IndifferentAccess`, `Hashie::Extensions::DeepLocate`, `Hashie::Extensions::Mash::SafeAssignment`, and `Hashie::Hash`, but none that were detectable via the test suite - [@michaelherold](https://github.com/michaelherold).
* [#435](https://github.com/hashie/hashie/pull/435): Mash `default_proc`s are now propagated down to nested sub-Hashes - [@michaelherold](https://github.com/michaelherold).
* [#436](https://github.com/hashie/hashie/pull/436): Ensure that `Hashie::Extensions::IndifferentAccess` injects itself after a non-destructive merge - [@michaelherold](https://github.com/michaelherold).
* [#437](https://github.com/hashie/hashie/pull/437): Allow codependent properties to be set on Dash - [@michaelherold](https://github.com/michaelherold).
* [#457](https://github.com/hashie/hashie/pull/457): Fix `Trash` to allow it to copy properties from other properties - [@michaelherold](https://github.com/michaelherold).
* [#326](https://github.com/hashie/hashie/pull/326): Added `Hashie::Extensions::Mash::KeepOriginalKeys` to give Mashes the ability to keep the original structure given to it - [@michaelherold](https://github.com/michaelherold).
* [#415](https://github.com/hashie/hashie/pull/415): Fixed Mash logging keys multiple times which lead to a bad user experience or, in some cases, errors - [@michaelherold](https://github.com/michaelherold).
* [#412](https://github.com/hashie/hashie/pull/412): Added a Hashie::Extensions::Mash::SymbolizeKeys extension that overrides the default stringification behavior for keys - [@michaelherold](https://github.com/michaelherold).
* [#409](https://github.com/hashie/hashie/pull/409): Fixed Railtie detection for projects where Rails is defined but Railties are not availble - [@CallumD](https://github.com/callumd).
* [#411](https://github.com/hashie/hashie/pull/411): Fixed a performance regression from 3.4.3 that caused a 10x slowdown in OmniAuth - [@michaelherold](https://github.com/michaelherold).
* [#402](https://github.com/hashie/hashie/pull/402): Use a Railtie to set Hashie.logger on rails boot - [@matthewrudy](https://github.com/matthewrudy).
* [#406](https://github.com/hashie/hashie/pull/406): Ensure that subclasses that disable warnings propagate that setting to grandchild classes - [@michaelherold](https://github.com/michaelherold).
* [#395](https://github.com/hashie/hashie/pull/395): Add the ability to disable warnings in Mash subclasses - [@michaelherold](https://github.com/michaelherold).
* [#400](https://github.com/hashie/hashie/pull/400): Fix Hashie.logger load and set the Hashie logger to the Rails logger in a Rails environment - [@michaelherold](https://github.com/michaelherold).
* [#397](https://github.com/hashie/hashie/pull/397): Add the integration specs harness into the main test tasks - [@michaelherold](https://github.com/michaelherold).
* [#396](https://github.com/hashie/hashie/pull/396): Fix for specs in #381: Incorrect use of shared context meant example was not being run - [@biinari](https://github.com/biinari).
* [#399](https://github.com/hashie/hashie/pull/399): Fix passing Pathname object to Hashie::Mesh.load() - [@albb0920](https://github.com/albb0920).
* [#386](https://github.com/hashie/hashie/pull/386): Fix for #385: Make `deep_merge` always `deep_dup` nested hashes before merging them in so that there are no shared references between the two hashes being merged. - [@mltsy](https://github.com/mltsy).
* [#389](https://github.com/hashie/hashie/pull/389): Support Ruby 2.4.0 - [@camelmasa](https://github.com/camelmasa).
* [#381](https://github.com/hashie/hashie/pull/381): Add a logging layer that lets us report potential issues to our users. As the first logged issue, report when a `Hashie::Mash` is attempting to overwrite a built-in method, since that is one of our number one questions - [@michaelherold](https://github.com/michaelherold).
* [#369](https://github.com/hashie/hashie/pull/369): If a translation for a property exists when using IndifferentAccess and IgnoreUndeclared, use the translation to find the property - [@whitethunder](https://github.com/whitethunder).
* [#376](https://github.com/hashie/hashie/pull/376): Leave string index unchanged if it can't be converted to integer for Array#dig - [@sazor](https://github.com/sazor).
* [#377](https://github.com/hashie/hashie/pull/377): Dont use Rubygems to check ruby version - [@sazor](https://github.com/sazor).
* [#378](https://github.com/hashie/hashie/pull/378): Deep find all searches inside all nested hashes - [@sazor](https://github.com/sazor).
* [#380](https://github.com/hashie/hashie/pull/380): Evaluate procs default values of Dash in object initialization - [@sazor](https://github.com/sazor).
* [#387](https://github.com/hashie/hashie/pull/387): Fixed builds failing due to Rake 11 having a breaking change - [@michaelherold](https://github.com/michaelherold).
* [#368](https://github.com/hashie/hashie/pull/368): Since `hashie/mash` can be required alone, require its dependencies - [@jrafanie](https://github.com/jrafanie).
* [#358](https://github.com/hashie/hashie/pull/358): Fixed support for Array#dig - [@modosc](https://github.com/modosc).
* [#365](https://github.com/hashie/hashie/pull/365): Ensured ActiveSupport::HashWithIndifferentAccess is defined before use in #deep_locate - [@mikejarema](https://github.com/mikejarema).
* [#319](https://github.com/hashie/hashie/pull/319): Fixed a regression from 3.4.1 where `Hashie::Extensions::DeepFind` is no longer indifference-aware - [@michaelherold](https://github.com/michaelherold).
* [#322](https://github.com/hashie/hashie/pull/322): Fixed `reverse_merge` issue with `Mash` subclasses - [@marshall-lee](https://github.com/marshall-lee).
* [#350](https://github.com/hashie/hashie/pull/350): Fixed from string translations used with `IgnoreUndeclared` - [@marshall-lee](https://github.com/marshall-lee).
* [#314](https://github.com/hashie/hashie/pull/314): Added a `StrictKeyAccess` extension that will raise an error whenever a key is accessed that does not exist in the hash - [@pboling](https://github.com/pboling).
* [#297](https://github.com/hashie/hashie/pull/297): Extracted `Trash`'s behavior into a new `Dash::PropertyTranslation` extension - [@michaelherold](https://github.com/michaelherold).
* [#281](https://github.com/hashie/hashie/pull/281): Added #reverse_merge to Mash to override ActiveSupport's version - [@mgold](https://github.com/mgold).
* [#270](https://github.com/hashie/hashie/pull/277): Fixed ArgumentError raised when using IndifferentAccess and HashWithIndifferentAccess - [@gardenofwine](https://github.com/gardenofwine).
* [#282](https://github.com/hashie/hashie/pull/282): Fixed coercions in a subclass accumulating in the superclass - [@maxlinc](https://github.com/maxlinc), [@martinstreicher](https://github.com/martinstreicher).
* [#251](https://github.com/hashie/hashie/pull/251): Added block support to indifferent access #fetch - [@jgraichen](https://github.com/jgraichen).
* [#252](https://github.com/hashie/hashie/pull/252): Added support for conditionally required Hashie::Dash attributes - [@ccashwell](https://github.com/ccashwell).
* [#254](https://github.com/hashie/hashie/pull/254): Added public utility methods for stringify and symbolize keys - [@maxlinc](https://github.com/maxlinc).
* [#260](https://github.com/hashie/hashie/pull/260): Added block support to Extensions::DeepMerge - [@galathius](https://github.com/galathius).
* [#271](https://github.com/hashie/hashie/pull/271): Added ability to define defaults based on current hash - [@gregory](https://github.com/gregory).
* [#249](https://github.com/hashie/hashie/pull/249): SafeAssignment will now also protect hash-style assignments - [@jrochkind](https://github.com/jrochkind).
* [#264](https://github.com/hashie/hashie/pull/264): Methods such as abc? return true/false with Hashie::Extensions::MethodReader - [@Zloy](https://github.com/Zloy).
* [#269](https://github.com/hashie/hashie/pull/269): Added #extractable_options? so ActiveSupport Array#extract_options! can extract it - [@ridiculous](https://github.com/ridiculous).
* [#231](https://github.com/hashie/hashie/pull/231): Added support for coercion on class type that inherit from Hash - [@gregory](https://github.com/gregory).
* [#233](https://github.com/hashie/hashie/pull/233): Custom error messages for required properties in Hashie::Dash subclasses - [@joss](https://github.com/joss).
* [#245](https://github.com/hashie/hashie/pull/245): Added Hashie::Extensions::MethodAccessWithOverride to autoloads - [@Fritzinger](https://github.com/Fritzinger).
* [#221](https://github.com/hashie/hashie/pull/221): Reduced amount of allocated objects on calls with suffixes in Hashie::Mash - [@kubum](https://github.com/kubum).
* [#224](https://github.com/hashie/hashie/pull/224): Merging Hashie::Mash now correctly only calls the block on duplicate values - [@amysutedja](https://github.com/amysutedja).
* [#228](https://github.com/hashie/hashie/pull/228): Made Hashie::Extensions::Parsers::YamlErbParser pass template filename to ERB - [@jperville](https://github.com/jperville).
* [#69](https://github.com/hashie/hashie/pull/69): Fixed regression in assigning multiple properties in Hashie::Trash - [@michaelherold](https://github.com/michaelherold), [@einzige](https://github.com/einzige), [@dblock](https://github.com/dblock).
* [#195](https://github.com/hashie/hashie/pull/195): Ensured that the same object is returned after injecting IndifferentAccess - [@michaelherold](https://github.com/michaelherold).
* [#201](https://github.com/hashie/hashie/pull/201): Hashie::Trash transforms can be inherited - [@fobocaster](https://github.com/fobocaster).
* [#200](https://github.com/hashie/hashie/pull/200): Improved coercion: primitives and error handling - [@maxlinc](https://github.com/maxlinc).
* [#206](https://github.com/hashie/hashie/pull/206): Fixed stack overflow from repetitively including coercion in subclasses - [@michaelherold](https://github.com/michaelherold).
* [#207](https://github.com/hashie/hashie/pull/207): Fixed inheritance of transformations in Trash - [@fobocaster](https://github.com/fobocaster).
* [#179](https://github.com/hashie/hashie/pull/179): Mash#values_at will convert each key before doing the lookup - [@nahiluhmot](https://github.com/nahiluhmot).
* [#184](https://github.com/hashie/hashie/pull/184): Allow ranges on Rash to match all Numeric types - [@medcat](https://github.com/medcat).
* [#169](https://github.com/hashie/hashie/pull/169): Hash#to_hash will also convert nested objects that implement to_hash - [@gregory](https://github.com/gregory).
* [#173](https://github.com/hashie/hashie/pull/173): Auto include Dash::IndifferentAccess when IndifferentAccess is included in Dash - [@gregory](https://github.com/gregory).
* [#171](https://github.com/hashie/hashie/pull/171): Include Trash and Dash class name when raising `NoMethodError` - [@gregory](https://github.com/gregory).
* [#174](https://github.com/hashie/hashie/pull/174): Fixed `from` and `transform_with` Trash features when IndifferentAccess is included - [@gregory](https://github.com/gregory).
* [#149](https://github.com/hashie/hashie/issues/149): Allow IgnoreUndeclared and DeepMerge to be used with undeclared properties - [@jhaesus](https://github.com/jhaesus).
* [#152](https://github.com/hashie/hashie/pull/152): Do not convert keys to String in Hashie::Dash and Hashie::Trash, use Hashie::Extensions::Dash::IndifferentAccess to achieve backward compatible behavior - [@dblock](https://github.com/dblock).
* [#152](https://github.com/hashie/hashie/pull/152): Do not automatically stringify keys in Hashie::Hash#to_hash, pass `:stringify_keys` to achieve backward compatible behavior - [@dblock](https://github.com/dblock).
* [#146](https://github.com/hashie/hashie/issues/146): Mash#respond_to? inconsistent with #method_missing and does not respond to #permitted? - [@dblock](https://github.com/dblock).
* [#169](https://github.com/hashie/hashie/pull/169): Hash#to_hash will also convert nested objects that implement `to_hash` - [@gregory](https://github.com/gregory).
* [#131](https://github.com/hashie/hashie/pull/131): Added IgnoreUndeclared, an extension to silently ignore undeclared properties at intialization - [@righi](https://github.com/righi).
* [#138](https://github.com/hashie/hashie/pull/138): Added Hashie::Rash, a hash whose keys can be regular expressions or ranges - [@epitron](https://github.com/epitron).
* [#144](https://github.com/hashie/hashie/issues/144): Fixed regression invoking `to_hash` with no parameters - [@mbleigh](https://github.com/mbleigh).
* [#89](https://github.com/hashie/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).
* [#69](https://github.com/hashie/hashie/issues/69): Fixed assigning multiple properties in Hashie::Trash - [@einzige](https://github.com/einzige).
* [#99](https://github.com/hashie/hashie/issues/99): Hash#deep_merge raises errors when it encounters integers - [@defsprite](https://github.com/defsprite).
* [#100](https://github.com/hashie/hashie/pull/100): IndifferentAccess#store will respect indifference - [@jrochkind](https://github.com/jrochkind).
* [#103](https://github.com/hashie/hashie/pull/103): Fixed support for Hashie::Dash properties that end in bang - [@thedavemarshall](https://github.com/thedavemarshall).
* [#107](https://github.com/hashie/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).
* [#110](https://github.com/hashie/hashie/pull/110): Correctly use Hash#default from Mash#method_missing - [@ryansouza](https://github.com/ryansouza).
* [#111](https://github.com/hashie/hashie/issues/111): Trash#translations correctly maps original to translated names - [@artm](https://github.com/artm).
* [#113](https://github.com/hashie/hashie/issues/113): Fixed Hash#merge with Hashie::Dash - [@spencer1248](https://github.com/spencer1248).
* [#120](https://github.com/hashie/hashie/pull/120): Pass options to recursive to_hash calls - [@pwillett](https://github.com/pwillett).
* [#129](https://github.com/hashie/hashie/pull/129): Added Trash#permitted_input_keys and inverse_translations - [@artm](https://github.com/artm).
* [#130](https://github.com/hashie/hashie/pull/130): IndifferentAccess now works without MergeInitializer - [@npj](https://github.com/npj).
* [#133](https://github.com/hashie/hashie/pull/133): Fixed Hash##to_hash with symbolize_keys - [@mhuggins](https://github.com/mhuggins).
* [#96](https://github.com/hashie/hashie/pull/96): Made coercion work better with non-symbol keys in Hashie::Mash - [@wapcaplet](https://github.com/wapcaplet).