zfs dump to non-zfs host

[Randy Bush]

>> files created with zsend might not be decodable in a future version, so
>> i can not zsend | to it.
> If this is the case then presumably there will be a migration tool.  zfs
> sending to a file is the officially recommended method.

that would be alright.  but the man page is pretty direct, brutal, and
negative;

>        The  format  of  the  stream is evolving. No backwards compatibility is
>        guaranteed. You may not be able to receive your streams on future  ver-
>        sions of ZFS.

this is not very reassuring.

randy