> Struct padding is a problem. Really, there shouldn't be any
> implicit padding. This causes:
> 
> 1. security leaks when such structs are copied to userspace
>    (the implicit padding is uninitialized, and so may contain
>    a chunk of somebody's private key or password)
> 
> 2. bloat, when struct members could be reordered to eliminate
>    the need for padding

(1) is a great point.   One of the first extensions in our first system
automatically reordered structure fields to minimize padding (your second
point), but we'd totally missed the security point.

Thanks!
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