Using frozen_string_literal and unfreezing a string argument results in Ambiguous positive number operator warning · Issue #4630 · rubocop/rubocop · GitHub
GitHub - Invoca/magic_frozen_string_literal: easily add '# frozen_string_literal: true' comments to the top of all your project's Ruby files
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Freezolite: the magic gem for keeping Ruby literals safely frozen—Martian Chronicles, Evil Martians' team blog
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