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A comment on Undefined behavior is often a thing for C programmers (2011). Parent comment

Re:Undefined behavior is often a thing for C programmers (2011) by AlotOfReading on Thursday September 03, 2020 @10:47AM (#24364550)
Is it really fair to call type punning "well defined"? To my knowledge, it was considered implementation defined from C89 all the way through C11.
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Re:Undefined behavior is often a thing for C programmers (2011) by sharpneli on Thursday September 03, 2020 @11:37AM (#24365055)
Before C11 char* was the only way to do type punning, badly. So it was basically forbidden, but still well defined.

Since then they specified that unions are the way to go.

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