It's a bit unfortunate that these three links doesn't quite tell
the same story. Note that the second page allows BOOL, int,
pointer, besides object! I've filed a bug report on the
documentation to see if they can clarify their position on this topic.
[With thanks to GP]:
The strict position was originally that only `id`-typed return values
are defined. In reality, return types with defined values are the
following:
* any pointer type
* any integer scalar of size less than or equal to sizeof(void*)
Return types with undefined values include:
* any struct type
* any large integer scalar
* any floating-point type
* any vector type
mmalc
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