LBM message (or message fragment) sequence number

C# |
public long sequenceNumber()

LBM message (or message fragment) sequence number

The sequence number of an LBM message is 32 bits. This field is a C#-style long
int (64 bits). Therefore, LBM only recognizes the lower 32 bits of this field.
When using hot-failover, this will be the hot failover sequence number when using 32 bit
and be zero when using 64 bit. To get the original sequence number when using hot-failover,
use the osqn() method.
