1. Enhancements

Elixir

• [File] Support distributed File.Stream
• [Module] Add Module.get_last_attribute/3
• [Task] Reduce footprint of tasks by avoiding unecessary work during spawning

ExUnit

• [ExUnit.Case] Add ExUnit.Case.get_last_registered_test/1

2. Bug fixes

Elixir

• [Code] Ensure :on_undefined_variable option works as advertised (regression)
• [Code] Format paths in Code.with_diagnostic/2 as relative paths (regression)
• [Kernel] Raise when macros are given to dialyzer
• [Kernel] Support bitstring specifiers as map keys in pattern (regression)
• [Module] Ensure that Module.get_attribute/3 returns nil and not the given default value when an attribute has been explicitly set as nil
• [Task] Do not double log Task failure reports

ExUnit

• [ExUnit.CaptureLog] Allow capturing deprecated log level (regression)
• [ExUnit.DocTest] Ensure proper line is returned when failing to parse doctest results

IEx

• [IEx] Fix IO operations not returning when booting IEx (regression)

Mix

• [mix deps] Ensure dependencies with included_applications can be loaded (regression)
• [mix format] Ensure proper formatter options are returned for files (regression)

3. Soft deprecations

Elixir

• [Kernel] Require pin variable when accessing variable inside binary size in match