Deadlock Detected (revisited)

I haven't seen anything to indicate that 8.x improves foreign key
refererence locking and fixes the foreign key 'deadlock detected' issue.
Has that been addressed in 8.1?

I sort my records before loading, but am still getting 'deadlock detected'
(still running 7.3.4).

I have

B references C
B references A
A references C

Any new records for C are loaded first (both A and B depend on C).

A is loaded next (B depends on A).

B is loaded last.

Both A and B are loaded in 'Table C' sorted order. However, a deadlock can
occur with one process's A records and another's B records, due to the fact
that both have a foreign key reference to C.

The only way I know of to eliminate the deadlocks without serializing the
processes is to remove the foreign key reference from either A or B.
However, jeopardizes referential integrity if something goes wrong with the
load process.

I've never quite understood why a READ of a record with a foreign key
reference results in the referenced record being locked with more than a
shared lock.

Wes