One more comment:
>5. Ihave Test
[...]
> Unlike most Sieve tests, ihave accepts no match or comparator
> arguments. The type of match for ihave is always ":is" and the
> comparator is always "i;ascii-casemap".
3028bis, section 6 says:
Capability string are case-sensitive
So, the default comparator must be "i;octet".
Yes. I'll change it.
Ned