aSub, EFLG, and array length changes

[Michael Davidsaver <mdavidsaver@bnl.gov>]

All,

I've come across an unexpected behavior with monitors on the VAL* fields 
of the aSub record.  It seems that the default is to post monitors only 
on change (EFLG="ON CHANGE").
Unfortunately, the calculation to determine if the value has changed 
doesn't work correctly in some cases.  The issue is that while the 
previous values are saved, the length of the previous values are not.  
So the comparison test uses the same length (NEV*) for VAL* and OVL*.  
Thus, if the change is that the array gets smaller, but the remaining 
values are unchanged, then no monitor is posted.
The obvious solution is to add another set of fields to track the number 
of element in the old value.  Does this seem reasonable?  Also, how to 
express "the number of element in OVLA" in 4 characters or less?

Michael