Without an operand, the ''butlast'' filter operator returns all but the last entry in the current list. The optional operand specifies the number of entries to omit.
For example:
|!Filter String |!Description |
|`one two three four five +[butlast[]]` |Returns `one`, `two`, `three`, `four` |
|`one two three four five +[butlast[2]]` |Returns `one`, `two`, `three` |
