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We have the `# frozen_string_literal: true` comment on all our
files. This means all string literals are frozen. There is no need
to call #freeze on any literals.
For files with `# frozen_string_literal: true`
```
puts %w{a b}[0].frozen?
=> true
puts "hi".frozen?
=> true
puts "a #{1} b".frozen?
=> true
puts ("a " + "b").frozen?
=> false
puts (-("a " + "b")).frozen?
=> true
```
For more details see: https://samsaffron.com/archive/2018/02/16/reducing-string-duplication-in-ruby
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| .. | ||
| authentication_results.rb | ||
| build_email_helper.rb | ||
| cleaner.rb | ||
| message_builder.rb | ||
| processor.rb | ||
| receiver.rb | ||
| renderer.rb | ||
| sender.rb | ||
| styles.rb | ||