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## Rails 6.0.0.alpha (Unreleased) ##
* Return all mappings for a timezone identifier in `country_zones`
Some timezones like `Europe/London` have multiple mappings in
`ActiveSupport::TimeZone::MAPPING` so return all of them instead
of the first one found by using `Hash#value`. e.g:
# Before
ActiveSupport::TimeZone.country_zones("GB") # => ["Edinburgh"]
# After
ActiveSupport::TimeZone.country_zones("GB") # => ["Edinburgh", "London"]
Fixes #31668.
*Andrew White*
* `String#truncate_bytes` to truncate a string to a maximum bytesize without
breaking multibyte characters or grapheme clusters like 👩👩👦👦.
*Jeremy Daer*
* `String#strip_heredoc` preserves frozenness.
"foo".freeze.strip_heredoc.frozen? # => true
Fixes that frozen string literals would inadvertently become unfrozen:
# frozen_string_literal: true
foo = <<-MSG.strip_heredoc
la la la
MSG
foo.frozen? # => false !??
*Jeremy Daer*
* Rails 6 requires Ruby 2.4.1 or newer.
*Jeremy Daer*
* Adds parallel testing to Rails
Parallelize your test suite with forked processes or threads.
*Eileen M. Uchitelle*, *Aaron Patterson*
Please check [5-2-stable](https://github.com/rails/rails/blob/5-2-stable/activesupport/CHANGELOG.md) for previous changes.
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