Table timeout/lifetime Not Reflected in -count

And for what its worth, I see that

 

 

set session_count_native [table keys -subtable $table_subname -count]

 

set session_count_length [llength [table keys -subtable $table_subname]]

 

 

$session_count_native and $session_count_length are not equal, even though I would expect them to be. I worry that the overhead associated with calculating $session_count_length is too great for my application, but certainly better than my previous approach of iterating over the list and incrementing a counter.