[Issue 16674] Clarify lifetime of pointer to AA entry

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16674

--- Comment #4 from anonymous4 <dfj1esp02 at sneakemail.com> ---
It's pretty obvious it's a clever low-level hack and relies on internal data
layout, which is preserved only by const/inout methods.

--