changelog.yml

---
- version: 1.10.0
  summary: This release is mostly about upgrading to dry-core 1.0 and dry-configurable 1.0. One of the outcomes is dropping dependency on dry-container (because it was moved to dry-core). If you happen to use dry-container, please switch to `Dry::Core::Container`.
  date: 2022-11-04
  changed:
  - 'Upgraded to the latest versions of dry-{core,configurable,logic,types} (@flash-gordon + @solnic)'
- version: 1.9.0
  summary:
  date: 2022-10-15
  fixed:
  - 'Duplicated keys mishandling in rule evaluation (issue #676 fixed via #711) (@mereghost)'
  added:
  changed:
  - 'Use Zeitwerk for auto-loading (via #715) (@solnic)'
- version: 1.8.1
  summary:
  date: '2022-05-28'
  fixed:
  - 'Raise an InvalidKeyErrors on substring of valid keys (issue #705 fixed via #706)
    (@MatElGran)'
  - 'Using `rule(:arr).each { .. }` doesn''t crash when `:arr` turns out to be `nil`
    (issue #708 fixed via #709) (@bautrey37)'
  added:
  changed:
- version: 1.8.0
  summary:
  date: '2022-02-17'
  fixed:
  added:
  - 'New rule helper `base_rule_error?` which checks if there''s any base error set
    (via #690) (@wuarmin)'
  changed:
  - Dependency on dry-schema was bumped to 1.9.1 (@solnic)
- version: 1.7.0
  date: '2021-09-12'
  changed:
  - "[internal] Upgraded to new `setting` API provided in dry-configurable 0.13.0
    (@timriley in #686 and 3f8f7d8)"
  - Bumped dry-schema dependency to 1.8.0 (in part, to ensure dry-configurable 0.13.0
    is available) (@timriley)
- version: 1.6.0
  summary:
  date: '2020-12-05'
  fixed:
  - 'Checking `key?` within a rule no longer crashes when value is `nil` or an empty
    string (issue #670 fixed via #672) (@alexxty7)'
  added:
  - 'You can now pass a key name or path to `rule_error?` predicate (issue #658 closed
    via #673) (@moofkit)'
  - 'You can now pass initial context object to `Contract#call` (issue #674 via #675)
    (@pyromaniac)'
  changed:
- version: 1.5.6
  date: '2020-09-04'
  summary:
  fixed:
  - Dependency on dry-schema was bumped to >= 1.5.1. This time for real (@solnic)
- version: 1.5.5
  date: '2020-09-03'
  summary:
  fixed:
  - 'Dependency on dry-schema was bumped to >= 1.5.2 (see #666 for more info) (@artofhuman)'
  added:
  changed:
- version: 1.5.4
  summary:
  date: '2020-08-21'
  fixed:
  - 'Full messages work correctly with rule failures now (issue #661 fixed via #662)
    (@stind)'
  - 'Providing a custom message template for array errors works correctly (issue #663
    fixed via #665) (@tadeusz-niemiec)'
  added:
  - 'You can now pass any key or a path to the rule''s `key?` helper (see #664 for
    more info) (@alassek)'
  changed:
- version: 1.5.3
  summary:
  date: '2020-07-27'
  fixed:
  - 'Using `.each(:foo)` works as expected when there are errors related to other
    keys (issue #659 fixed via #660) (@solnic)'
  added:
  - 'You can now access current value''s index via `rule(:foo).each do |index:|` (issue
    #606 done via #657) (@mrbongiolo)'
  changed:
  - "`Result#error?` is now a public API and it takes into consideration both schema
    and rule errors (issue #655 fixed via #656) (@PragTob)"
- version: 1.5.2
  summary:
  date: '2020-07-14'
  fixed:
  - "`key?` predicate in rules no longer crashes when the rule path points to a non-existent
    array value (issue #653 fixed via #654) (@solnic)"
- version: 1.5.1
  date: '2020-06-18'
  fixed:
  - dry-monads no longer required for the `:hints` extension (@schokomarie)
  - 'Using `full: true` option works as expected with custom rule messages (issue
    #618 fixed via #651) (@sirfilip)'
  - 'Using `locale: ...` option works as expected with hints (issue #589 fixed via
    652) (@sirfilip)'
- version: 1.5.0
  summary:
  date: '2020-03-11'
  fixed:
  added:
  - "`schema_error?` rule helper (@waiting-for-dev)"
  - "`rule_error?` rule helper (@waiting-for-dev)"
  changed:
  - dry-schema dependency was bumped to `~> 1.5` (@solnic)
  - "[internal] `KeyMap` patches have been removed since dry-schema now provides required
    functionality (@solnic)"
- version: 1.4.2
  date: '2020-01-18'
  fixed:
  - Macros using predicates that accept a range argument work as expected (no need
    to wrap the argument in an array) (@waiting-for-dev)
- version: 1.4.1
  date: '2020-01-08'
  added:
  - Pattern matching on result values (@flash-gordon)
  fixed:
  - 'List tokens are correctly interpolated as a comma separated list in rule messages
    (see #611) (@waiting-for-dev)'
  - Warnings about delegated keywords (@flash-gordon)
- version: 1.4.0
  date: '2019-12-12'
  added:
  - Support for multi-schema inheritance (@ianwhite)
  fixed:
  - Keyword warnings reported by Ruby 2.7 (@flash-gordon)
  - Fixed an issue where `MessageSet` would be marked as empty too early (@ianwhite)
  - 'Messages are correctly generated when there are errors for both an array and
    one or more of its elements (see #599) (@Bugagazavr)'
  changed:
  - A meaningful exception is raised when failure options are not valid (@MatElGran)
  - "[internal] improved performance in `Contract.ensure_valid_keys` (@grzegorz-jakubiak)"
  - "[internal] fixed keyword warnings on MRI 2.7.0 (@flash-gordon)"
- version: 1.3.1
  date: '2019-08-16'
  changed:
  - You can now set an external schema without providing a block (@alassek)
- version: 1.3.0
  date: '2019-08-14'
  added:
  - 'Support for setting an external schema (that can be extended too) (fixed #574)
    (@solnic)'
  fixed:
  - 'Using a hash spec to define rule keys with more than one value is properly handled
    by rule guard now (fixed #576) (@solnic)'
  changed:
  - "`values` within rules uses `Hash#fetch_values` internally now, which improves
    performance (@esparta)"
- version: 1.2.1
  date: '2019-07-16'
  fixed:
  - 'Defining an abstract contract class that has no schema no longer crashes (issue
    #565) (@solnic)'
  - 'Fixed an issue where `Rule#each` would crash when the value is not an array (issue
    #567) (@solnic)'
  - 'Fixed an issue where guarding a rule would crash when keys are missing in the
    input (issue #569) (@solnic)'
  - 'Added missing "pathname" require (issue #570) (@solnic)'
- version: 1.2.0
  date: '2019-07-08'
  added:
  - New extension `:predicates_as_macros` (@waiting-for-dev)
  fixed:
  - 'Guarding rules for nested keys works correctly (issue #560) (@solnic)'
  changed:
  - "`dry-schema` dependency was bumped to `>= 1.3.1` (@solnic)"
- version: 1.1.1
  date: '2019-06-24'
  fixed:
  - "`Rule#each` works with array values from nested hashes (@mustardnoise)"
- version: 1.1.0
  date: '2019-06-14'
  added:
  - "`key?` method available within rules, that can be used to check if there's a
    value under the rule's default key (refs #540) (@solnic)"
  - "`value` supports hash-based path specifications now (refs #547) (@solnic)"
  - "`value` can read multiple values when the key points to them, ie in case of `rule(geo:
    [:lat, :lon])` it would return an array with `lat` and `lon` (@solnic)"
  fixed:
  - 'Passing multiple macro names to `validate` or `each` works correctly (fixed #538
    #541) (@jandudulski)'
- version: 1.0.0
  date: '2019-06-10'
  summary: See [the list of all addressed issues](https://github.com/dry-rb/dry-validation/issues?utf8=✓&q=is%3Aissue+is%3Aclosed+closed%3A%3E%3D2019-01-01+)
    as well as issues that were moved to dry-schema and [addressed there](https://github.com/dry-rb/dry-schema/issues?q=is%3Aissue+is%3Aclosed+dry-validation+milestone%3A1.0.0).
- version: 1.0.0
  date: '2019-06-10'
  added:
  - Support for defining rules for each element of an array via `rule(:items).each
    { ... }` (solnic)
  - 'Support for parameterized macros via `rule(:foo).validate(my_macro: :some_option)`
    (solnic)'
  - "`values#[]` is now compatible with path specs (symbol, array with keys or dot-notation)
    (issue #528) (solnic)"
  - "`value` shortcut for accessing the value found under the first key specified
    by a rule. ie `rule(:foo) { value }` returns `values[:foo]` (solnic)"
  fixed:
  - Contract's `config.locale` option was replaced by `config.messages.default_locale`
    to avoid conflicts with run-time `:locale` option and/or whatever is set via `I18n`
    gem (solnic)
  - Macros no longer mutate `Dry::Validation::Contract.macros` when using inheritance
    (solnic)
  - Missing dependency on `dry-container` was added (solnic)
  changed:
  - "`rule` will raise `InvalidKeysError` when specified keys are not defined by the
    schema (solnic)"
  - "`Contract.new` will raise `SchemaMissingError` when the class doesn't have schema
    defined (solnic)"
  - 'Contracts no longer support `:locale` option in the constructor. Use `Result#errors(locale:
    :pl)` to change locale at run-time (solnic)'
- version: 1.0.0.rc3
  date: '2019-05-06'
  added:
  - "[EXPERIMENTAL] `Validation.register_macro` for registering global macros (solnic)"
  - "[EXPERIMENTAL] `Contract.register_macro` for registering macros available to
    specific contract classes (solnic)"
  - "`Dry::Validation.Contract` shortcut for quickly defining a contract and getting
    its instance back (solnic)"
  - New configuration option `config.locale` for setting the default locale (solnic)
  fixed:
  - "`config/errors.yml` are now bundled with the gem, **`rc2` was broken because
    of this** (solnic)"
- version: 1.0.0.rc2
  date: '2019-05-04'
  summary: This was **yanked** on rubygems.org because the bundled gem was missing
    `config` directory, thus it was not possible to require it. It was fixed in `rc3`.
  added:
  - "[EXPERIMENTAL] support for registering macros via `Dry::Validation::Macros.register(:your_macro,
    &block)` (solnic)"
  - "[EXPERIMENTAL] `:acceptance` as the first built-in macro (issue #157) (solnic)"
  fixed:
  - Passing invalid argument to `failure` will raise a meaningful error instead of
    crashing (solnic)
  changed:
  - In rule validation blocks, `values` is now an instance of a hash-like `Dry::Validation::Values`
    class, rather than `Dry::Schema::Result`. This gives more convenient access to
    data within rules (solnic)
  - Dependency on `dry-schema` was updated to `~> 1.0` (solnic)
- version: 1.0.0.rc1
  date: '2019-04-26'
  added:
  - "`:hints` extension is back (solnic)"
  - "`Result` objects have access to the context object which is shared between rules
    (flash-gordon)"
  fixed:
  - Multiple hint messages no longer crash message set (flash-gordon)
  - "`Contract#inspect` no longer crashes (solnic)"
  changed:
  - Dependency on `dry-schema` was bumped to `~> 0.6` - this pulls in `dry-types 1.0.0`
    and `dry-logic 1.0.0` (solnic)
  - Dependency on `dry-initializer` was bumped to `~> 3.0` (solnic)
- version: 1.0.0.beta2
  date: '2019-04-04'
  added:
  - |-
    Support for arbitrary meta-data in failures, ie:

      ```ruby
      class NewUserContract < Dry::Validation::Contract
        params do
          required(:login).filled(:string)
        end

        rule(:login) do
          key.failure(text: 'is taken', code: 123) unless db.unique?(values[:login])
        end
      end
      ```

      Now your error hash will include `{ login: [{ text: 'is taken', code: 123 }] }` (solnic + flash-gordon)
  changed:
  - "[BREAKING] `Error` was renamed to `Message` as it is a more generic concept (solnic)"
  - "[BREAKING] `ErrorSet` was renamed to `MessageSet` for consistency (solnic)"
  - "[BREAKING] `:monads` extension wraps entire result objects in `Success` or `Failure`
    (flash-gordon)"
- version: 1.0.0.beta1
  date: '2019-03-26'
  added:
  - New API for setting failures `base.failure` for base errors and `key.failure`
    for key errors (solnic)
  - Support for `base` errors associated with a key even when child keys have errors
    too (solnic)
  - Support for `base` errors not associated with any key (solnic)
  - Result objects use `ErrorSet` object now for managing messages (solnic)
  - 'Nested keys are properly handled when generating messages hash (issue #489) (flash-gordon
    + solnic)'
  - Result objects support `locale` and `full` options now (solnic)
  - Ability to configure `top_namespace` for messages, which will be used for both
    schema and rule localization (solnic)
  - Rule blocks receive a context object that you can use to share data between rules
    (solnic)
  changed:
  - "[BREAKING] `Result#errors` returns an instance of `ErrorSet` now, it's an enumerable,
    coerible to a hash (solnic)"
  - "[BREAKING] `failure` was removed in favor of `key.failure` or `key(:foo).failure`
    (solnic)"
  - "[BREAKING] `Result#to_hash` was removed (flash-gordon)"
- version: 1.0.0.alpha2
  date: '2019-03-05'
  summary: First round of bug fixes. Thanks for testing <3!
  fixed:
  - Errors with nested messages are correctly built (flash-gordon)
  - Messages for nested keys are correctly resolved (solnic)
  - A message for a nested key is resolved when it's defined under `errors.rule.%{key}`
    too, but a message under nested key will override it (solnic)
  changed:
  - When a message template is not found a more meaningful error is raised that includes
    both rule identifier and key path (solnic)
- version: 1.0.0.alpha1
  date: '2019-03-04'
  summary: Complete rewrite on top of `dry-schema`.
  added:
  - "[BREAKING] `Dry::Validation::Contract` as a replacement for validation schemas
    (solnic)"
  - "[BREAKING] New `rule` DSL with an improved API for setting error messages (solnic)"
- version: 0.13.0
  date: '2019-01-29'
  fixed:
  - Warning about method redefined (amatsuda)
  changed:
  - "`dry-logic` was bumped to `~> 0.5` (solnic)"
  - "`dry-types` was bumped to `~> 0.14` (solnic)"
- version: 0.12.3
  date: '2019-01-29'
  changed:
  - "[internal] dry-logic was pinned to `~> 0.4.2` (flash-gordon)"
- version: 0.12.2
  date: '2018-08-29'
  fixed:
  - Use correct key names for rule messages when using i18n (jozzi05)
- version: 0.12.1
  date: '2018-07-06'
  fixed:
  - "[internal] fixed deprecation warnings (flash-gordon)"
- version: 0.12.0
  date: '2018-05-31'
  changed:
  - Code updated to work with `dry-types` 0.13.1 and `dry-struct` 0.5.0, these are
    now minimal supported versions (flash-gordon)
  - "[BREAKING] `Form` was renamed to `Params` to be consistent with the latest changes
    from `dry-types`. You can `require 'dry/validation/compat/form'` to use the previous
    names but it will be removed in the next version (flash-gordon)"
- version: 0.11.1
  date: '2017-09-15'
  changed:
  - "`Result#to_either` was renamed to `#to_monad`, the previous name is kept for
    backward compatibility (flash-gordon)"
  - "[internal] fix warnings from dry-types v0.12.0"
- version: 0.11.0
  date: '2017-05-30'
  changed:
  - "[internal] input processor compilers have been updated to work with new dry-types'
    AST (GustavoCaso)"
- version: 0.10.7
  date: '2017-05-15'
  fixed:
  - "`validate` can now be defined multiple times for the same key (kimquy)"
  - Re-using rules between schemas no longer mutates original rule set (pabloh)
- version: 0.10.6
  date: '2017-04-26'
  fixed:
  - Fixes issue with wrong localized error messages when namespaced messages are used
    (kbredemeier)
- version: 0.10.5
  date: '2017-01-12'
  fixed:
  - Warnings under MRI 2.4.0 are gone (koic)
- version: 0.10.4
  date: '2016-12-03'
  fixed:
  - Updated to dry-core >= 0.2.1 (ruby warnings are gone) (flash-gordon)
  - "`format?` predicate is excluded from hints (solnic)"
  changed:
  - "`version` file is now required by default (georgemillo)"
- version: 0.10.3
  date: '2016-09-27'
  fixed:
  - Custom predicates work correctly with `each` macro (solnic)
- version: 0.10.2
  date: '2016-09-23'
  fixed:
  - Constrained types + hints work again (solnic)
- version: 0.10.1
  date: '2016-09-22'
  fixed:
  - Remove obsolete require of `dry/struct` which is now an optional extension (flash-gordon)
- version: 0.10.0
  date: '2016-09-21'
  added:
  - Support for `validate` DSL which accepts an arbitratry validation block that gets
    executed in the context of a schema object and is treated as a custom predicate
    (solnic)
  - Support for `or` error messages ie "must be a string or must be an integer" (solnic)
  - Support for retrieving error messages exclusively via `schema.(input).errors`
    (solnic)
  - Support for retrieving hint messages exclusively via `schema.(input).hints` (solnic)
  - Support for opt-in extensions loaded via `Dry::Validation.load_extensions(:my_ext)`
    (flash-gordon)
  - Add `:monads` extension which transforms a result instance to `Either` monad,
    `schema.(input).to_either` (flash-gordon)
  - Add `dry-struct` integration via an extension activated by `Dry::Validation.load_extensions(:struct)`
    (flash-gordon)
  fixed:
  - Input rules (defined via `input` macro) are now lazy-initialized which makes it
    work with predicates defined on the schema object (solnic)
  - Hints are properly generated based on argument type in cases like `size?`, where
    the message should be different for strings (uses "length") or other types (uses
    "size") (solnic)
  - Defining nested keys without `schema` blocks results in `ArgumentError` (solnic)
  changed:
  - "[BREAKING] `when` macro no longer supports multiple disconnected rules in its
    block, whatever the block returns will be used for the implication (solnic)"
  - "[BREAKING] `rule(some_name: %i(some keys))` will _always_ use `:some_name` as
    the key for failure messages (solnic)"
- version: 0.9.5
  date: '2016-08-16'
  fixed:
  - 'Infering multiple predicates with options works as expected ie `value(:str?,
    min_size?: 3, max_size?: 6)` (solnic)'
  - Default `locale` configured in `I18n` is now respected by the messages compiler
    (agustin + cavi21)
- version: 0.9.4
  date: '2016-08-11'
  fixed:
  - Error messages for sibling deeply nested schemas are nested correctly (timriley)
- version: 0.9.3
  date: '2016-07-22'
  added:
  - Support for range arg in error messages for `excluded_from?` and `included_in?`
    (mrbongiolo)
  - "`Result#message_set` returns raw message set object (solnic)"
  fixed:
  - Error messages for high-level rules in nested schemas are nested correctly (solnic)
  - Dumping error messages works with high-level rules relying on the same value (solnic)
  changed:
  - "`#messages` is no longer memoized (solnic)"
- version: 0.9.2
  date: '2016-07-13'
  fixed:
  - Constrained types now work with `each` macro (solnic)
  - Array coercion without member type works now ie `required(:arr).maybe(:array?)`
    (solnic)
- version: 0.9.1
  date: '2016-07-11'
  fixed:
  - "`I18n` backend is no longer required and set by default (solnic)"
- version: 0.9.0
  date: '2016-07-08'
  added:
  - Support for defining maybe-schemas via `maybe { schema { .. } }` (solnic)
  - Support for interpolation of custom failure messages for custom rules (solnic)
  - Support for defining a base schema **class** with config and rules (solnic)
  - Support for more than 1 predicate in `input` macro (solnic)
  - Class-level `define!` API for defining rules on a class (solnic)
  - "`:i18n` messages support merging from other paths via `messages_file` setting
    (solnic)"
  - Support for message token transformations in custom predicates (fran-worley)
  - "[EXPERIMENTAL] Ability to compose predicates that accept dynamic args provided
    by the schema (solnic)"
  fixed:
  - Duped key names in nested schemas no longer result in invalid error messages structure
    (solnic)
  - Error message structure for deeply nested each/schema rules (solnic)
  - Values from `option` are passed down to nested schemas when using `Schema#with`
    (solnic)
  - Hints now work with array elements too (solnic)
  - Hints for elements are no longer provided for an array when the value is not an
    array (solnic)
  - "`input` macro no longer messes up error messages for nested structures (solnic)"
  changed:
  - Tokens for `size?` were renamed `left` => `size_left` and `right` => `size_right`
    (fran-worley)
- version: 0.8.0
  date: '2016-07-01'
  added:
  - Explicit interface for type specs used to set up coercions, ie `required(:age,
    :int)` (solnic)
  - 'Support new dry-logic predicates: `:excluded_from?`, `:excludes?`, `:included_in?`,
    `:includes?`, `:not_eql?`, `:odd?`, `:even?` (jodosha, fran-worley)'
  - Support for blocks in `value`, `filled` and `maybe` macros (solnic)
  - Support for passing a schema to `value|filled|maybe` macros ie `maybe(SomeSchema)`
    (solnic)
  - Support for `each(SomeSchema)` (solnic)
  - 'Support for `value|filled|maybe` macros + `each` inside a block ie: `maybe(:filled?)
    { each(:int?) }` (solnic)'
  - Support for dedicated hint messages via `en.errors.#{predicate}.(hint|failure)`
    look-up paths (solnic)
  - Support for configuring custom DSL extensions via `dsl_extensions` setting on
    Schema class (solnic)
  - Support for preconfiguring a predicate for the input value ie `value :hash?` used
    for prerequisite-checks (solnic)
  - Infer coercion from constrained types (solnic)
  - Add value macro (coop)
  - 'Enable .schema to accept objects that respond to #schema (ttdonovan)'
  - Support for schema predicates which don't need any arguments (fran-worley)
  - Error and hint messages have access to all predicate arguments by default (fran-worley+solnic)
  - Invalid predicate name in DSL will raise an error (solnic)
  - Predicate with invalid arity in DSL will raise an error (solnic)
  fixed:
  - Support for jRuby 9.1.1.0 (flash-gordon)
  - Fix bug when using predicates with options in each and when (fran-worley)
  - Fix bug when validating custom types (coop)
  - Fix depending on deeply nested values in high-lvl rules (solnic)
  - Fix duplicated error message for lt? when hint was used (solnic)
  - Fix hints for nested schemas (solnic)
  - Fix an issue where rules with same names inside nested schemas have incorrect
    hints (solnic)
  - Fix a bug where hints were being generated 4 times (solnic)
  - Fix duplicated error messages when message is different than a hint (solnic)
  changed:
  - Uses new `:weak` hash constructor from dry-types 0.8.0 which can partially coerce
    invalid hash (solnic)
  - "`key` has been deprecated in favor of `required` (coop)"
  - "`required` has been deprecated in favor of `filled` (coop)"
  - Now relies on dry-logic v0.3.0 and dry-types v0.8.0 (fran-worley)
  - Tring to use illogical predicates with maybe and filled macros now raise InvalidSchemaError
    (fran-worley)
  - Enable coercion on form.true and form.false (fran-worley)
  - Remove attr (will be extracted to a separate gem) (coop)
  - Deprecate required in favour of filled (coop)
  - Deprecate key in favor of required (coop)
  - Remove nested key syntax (solnic)
- version: 0.7.4
  date: '2016-04-06'
  added:
  - "`Schema.JSON` with json-specific coercions (coop)"
  - Support for error messages for `odd? and`even?` predicates (fran-worley)
  fixed:
  - Depending on deeply nested values in high-level rules works now (solnic)
- version: 0.7.3
  date: '2016-03-30'
  added:
  - Support for inferring rules from constrained type (coop + solnic)
  - Support for inferring nested schemas from `Dry::Types::Struct` classes (coop)
  - Support for `number?` predicate (solnic)
  fixed:
  - Creating a nested schema properly sets full path to nested data structure (solnic)
  - Error message for `empty?` predicate is now correct (jodosha)
- version: 0.7.2
  date: '2016-03-28'
  added:
  - Support for nested schemas inside high-level rules (solnic)
  - "`Schema#to_proc` so that you can do `data.each(&schema)` (solnic)"
- version: 0.7.1
  date: '2016-03-21'
  added:
  - You can use `schema` inside `each` macro (solnic)
  fixed:
  - "`confirmation` macro defines an optional key with maybe value with `_confirmation`
    suffix (solnic)"
  - "`each` macro works correctly when its inner rule specify just one key (solnic)"
  - error messages for `each` rules where input is equal are now correctly generated
    (solnic)
  changed:
  - Now depends on `dry-logic` >= `0.2.1` (solnic)
- version: 0.7.0
  date: '2016-03-16'
  added:
  - |-
    Support for macros:
      - `required` - when value must be filled
      - `maybe` - when value can be nil (or empty, in case of `Form`)
      - `when` - for composing high-level rule based on predicates applied to a
        validated value
      - `confirmation` - for confirmation validation
  - Support for `value(:foo).eql?(value(:bar))` syntax in high-level rules (solnic)
  - New DSL for defining schema objects `Dry::Validation.Schema do .. end` (solnic)
  - Ability to define a schema for an array via top-level `each` rule (solnic)
  - Ability to define nested schemas via `key(:location).schema do .. end` (solnic)
  - Ability to re-use schemas inside other schemas via `key(:location).schema(LocationSchema)`
    (solnic)
  - Ability to inherit rules from another schema via `Dry::Validation.Schema(Other)
    do .. end` (solnic)
  - Ability to inject arbitrary dependencies to schemas via `Schema.option` + `Schema#with`
    (solnic)
  - Ability to provide translations for rule names under `%{locale}.rules.%{name}`
    pattern (solnic)
  - Ability to configure input processor, either `:form` or `:sanitizer` (solnic)
  - Ability to pass a constrained dry type when defining keys or attrs, ie `key(:age,
    Types::Age)` (solnic)
  - "`Result#messages` supports `:full` option to get messages with rule names, disabled
    by default (solnic)"
  - |-
    `Validation::Result` responds to `#[]` and `#each` (delegating to its output)
      and it's an enumerable (solnic)
  fixed:
  - Qualified rule names properly use last node by default for error messages (solnic)
  - Validation hints only include relevant messages (solnic)
  - "`:yaml` messages respect `:locale` option in `Result#messages` (solnic)"
  changed:
  - "`schema` was **removed** from the DSL, just use `key(:name).schema` instead (solnic)"
  - "`confirmation` is now a macro that you can call on a key rule (solnic)"
  - |-
    rule names for nested structures are now fully qualified, which means you can
      provide customized messages for them. ie `user: :email` (solnic)
  - "`Schema::Result#params` was renamed to `#output` (solnic)"
  - |-
    `Schema::Result` is now `Validation::Result` and it no longer has success and
      failure results, only error results are provided (solnic)
- version: 0.6.0
  date: '2016-01-20'
  added:
  - Support for validating objects with attr readers via `attr` (SunnyMagadan)
  - Support for `value` interface in the DSL for composing high-level rules based
    on values (solnic)
  - |-
    Support for `rule(name: :something)` syntax for grouping high-level rules under
      the same name (solnic)
  - 'Support for `confirmation(:foo, some_predicate: some_argument)` shortcut syntax
    (solnic)'
  - Support for error messages for grouped rules (like `confirmation`) (solnic)
  - Schemas support injecting rules from the outside (solnic)
  - "## Changed"
  - |-
    `rule` uses objects that inherit from `BasicObject` to avoid conflicts with
      predicate names and built-in `Object` methods (solnic)
  - |-
    In `Schema::Form` both `key` and `optional` will apply `filled?` predicate by
      default when no block is passed (solnic)
- version: 0.5.0
  date: '2016-01-11'
  fixed:
  - "`Schema::Form` uses safe `form.array` and `form.hash` types which fixes #42 (solnic)"
  changed:
  - Now depends on [dry-logic](https://github.com/dry-rb/dry-logic) for predicates
    and rules (solnic)
  - "`dry/validation/schema/form` is now required by default (solnic)"
- version: 0.4.1
  date: '2015-12-27'
  added:
  - Support for `each` and type coercion inference in `Schema::Form` (solnic)
- version: 0.4.0
  date: '2015-12-21'
  added:
  - Support for high-level rule composition via `rule` interface (solnic)
  - Support for exclusive disjunction (aka xor/^ operator) (solnic)
  - Support for nested schemas within a schema class (solnic)
  - Support for negating rules via `rule(name).not` (solnic)
  - Support for `validation hints` that are included in the error messages (solnic)
  fixed:
  - Error messages hash has now consistent structure `rule_name => [msgs_array, input_value]`
    (solnic)
- version: 0.3.1
  date: '2015-12-08'
  added:
  - Support for `Range` and `Array` as an argument in `size?` predicate (solnic)
  fixed:
  - Error compiler returns an empty hash rather than a nil when there are no errors
    (solnic)
- version: 0.3.0
  date: '2015-12-07'
  added:
  - I18n messages support (solnic)
  - Ability to configure `messages` via `configure { config.messages = :i18n }` (solnic)
  - "`rule` interface in DSL for defining rules that depend on other rules (solnic)"
  - '`confirmation` interface as a shortcut for defining "confirmation of" rule (solnic)'
  - Error messages can be now matched by input value type too (solnic)
  fixed:
  - "`optional` rule with coercions work correctly with `|` + multiple `&`s (solnic)"
  - "`Schema#[]` checks registered predicates first before defaulting to its own predicates
    (solnic)"
  changed:
  - "`Schema#messages(input)` => `Schema#call(input).messages` (solnic)"
  - |-
    `Schema#call` returns `Schema::Result` which has access to all rule results,
      errors and messages
  - "`Schema::Result#messages` returns a hash with rule names, messages and input
    values (solnic)"
- version: 0.2.0
  date: '2015-11-30'
  added:
  - "`Schema::Form` with a built-in coercer inferred from type-check predicates (solnic)"
  - Ability to pass a block to predicate check in the DSL ie `value.hash? { ... }`
    (solnic)
  - Optional keys using `optional(:key_name) { ... }` interface in the DSL (solnic)
  - |-
    New predicates:
      - `bool?`
      - `date?`
      - `date_time?`
      - `time?`
      - `float?`
      - `decimal?`
      - `hash?`
      - `array?`
  fixed:
  - Added missing `and` / `or` interfaces to composite rules (solnic)
- version: 0.1.0
  date: '2015-11-25'
  summary: First public release