Required files
active_support/core_ext/hash/conversions
active_support/core_ext/hash/deep_merge
active_support/core_ext/hash/diff
active_support/core_ext/hash/except
active_support/core_ext/hash/indifferent_access
active_support/core_ext/hash/keys
active_support/core_ext/hash/reverse_merge
active_support/core_ext/hash/slice