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Re:Show HN: UXY – adding structure to Unix tools by adrianratnapala on Monday May 20, 2019 @06:00PM (#19965725)
But as written, the definition permits generating the weird output. Which ignores the other arm of Postel's principle.

You could have the format definition forbid these characters; and then in the section about Postel's principle have "If you choose to accept forbidden characters, you MUST treat them as '?'".

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