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CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## Unreleased
+
+---
+
+## [0.4.0] - 2023-01-26
+
+### Added
+
+- Component grouping and `Registry:group()`.
+- Method `View:use()`.
+- Constant `ecr.null`.
+
+### Removed
+
+- Method `View:include()` and `Observer:include()`.
+
+### Fixed
+
+- `Registry:add()` not firing `Registry:added()` signals.
+- Mismatch between argument list and values returned in multi-typed observers.
+- Observers not garbage collecting after calling `Observer:disconnect()`.
+
+### Improved
+
+- Connection firing speed by ~70%.
+
+---
+
+## [0.3.0] - 2023-01-09
+
+### Added
+
+- Overload for `Registry:create()` to create an entity with a given identifier.
+
+### Changed
+
+- Registry signals no longer pass the registry as the first argument to listeners.
+- Observers no longer track entities with removed components.
+- Method `Registry:entities()` now creates and returns an array of only valid entities.
+- Function `ecr.registry()` can no longer pre-allocate memory.
+
+### Removed
+
+- Method `Registry:capacity()`.
+
+### Improved
+
+- Double-type view iteration speed by ~100%.
+
+---
+
+## [0.2.0] - 2022-12-08
+
+### Added
+
+- Method `View:include()` and `Observer:include()`.
+- Method `Registry:patch()`.
+- Method `Registry:add()` and optional default parameter for `ecr.component()`.
+
+### Changed
+
+- Behavior `for ... in View do` now behaves the same as `for ... in View:each() do`.
+- Signal diconnect API (Signal now returns a connection object to call disconnect on).
+
+### Improved
+
+- Entity creation and release speed by ~100%.
+- Multi-type view iteration speed by ~60%.
+
+## [0.1.0] - 2022-11-16
+
+- Initial release