dfr not for dataframe> dfr not {flags} 
| input | output | 
|---|---|
| any | any | 
Inverts boolean mask
> [truefalsetrue] |dfr into-df|dfr not
╭───┬───────╮
│# │   0   │
├───┼───────┤
│0│false│
│1│true│
│2│false│
╰───┴───────╯
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag
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    https://www.nushell.sh/commands/docs/dfr_not.html