It's going to take some more work, but here are the
first two errors that I know are not fatal:

isc_segment,
isc_segstr_eof,

The first indicates that a blob read is incomplete.
The second, that the blob read is complete.

There is a convention that serious internal errors
cause the connection to return isc_bug_check on
all subsequent requests through the transaction.
Rather than checking everything, maybe just checking
for that would work...

Regards,


Ann