[Community Puzzle] Frequency-Based Decryption

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Created by @ElPeauDeLaBanana,validated by @DeanTheMachine,@FredericLocquet and @Matsoy.
If you have any issues, feel free to ping them.

Instead of comparing the frequency of letters in the message with the reference frequencies of the English language, I accidentally compared the number of occurrences of letters in the message with the frequencies-as-percentages of the English language.

I still got all the tests and validators correct despite not fixing the bug! Presumably because there is approximately 100 letters per message!