CPP11 — Alias type codes in any values

Summary: I believe the spec should be updated to explicitly require the following
to be safe: a1.replace(a1.type(), a1.value(), false);
In other words, an Any should be obliged to detect assignment to self
for the passed void *. Reason: The above is the only way I can see
to get a tk_alias type code into an any, so the receiver can tell the
difference between a date and an address.

Close issue with no change – already resolved in section 20.16.8.