dfr not for dataframe

Inverts boolean mask.

Signature

> dfr not

Examples

Inverts boolean mask

> [true false true] | dfr into-df | dfr not
╭───┬───────╮
│ # │   0   │
├───┼───────┤
│ 0 │ false │
│ 1 │ true  │
│ 2 │ false │
╰───┴───────╯