https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2310.pdf
"99) If the member used to read the contents of a union object is not the same as the member last used to store a value in the
object, the appropriate part of the object representation of the value is reinterpreted as an object representation in the new
type as described in 6.2.6 (a process sometimes called "type punning"). This might be a trap representation."
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text/gemini
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