Keys for deleted rows visible in CLI

[Maxim Potekhin]

Hello,

I searched the archives and it appears that this question was once asked but
was not answered. I just deleted a lot of rows, and want to "list" in 
cli. I still see
the keys. This is not the same as getting slices, is it? Anyhow, what's 
the reason
and rationale? I run 0.8.8.
Thanks

Maxim