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InstantDB: multiple returns for 'last_value' internal param


in trying to retrieve the 'last_value' internal param from a given table with :

SELECT __IDB_INTERNAL last_value FROM TEXT('id') IN TABLE asUser_seq

I get a number of results equal to the number of records in the table 
returned.  They are all the correct 'last_value' number, but is there 
a way to simply get the value without the multiples?

P.S. -
If I use DISTINCT, I get only one return, but on a table with a large 
number of entries, wouldn't this add a lot of overhead to the 
procedure?

Thanks in advance.
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