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 '?'".
Comments
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 '?'".