return for core> return {flags} (return_value)
return_value: optional value to return| input | output | 
|---|---|
| nothing | any | 
Return early
>deffoo [] { return }
This command is a parser keyword. For details, check: https://www.nushell.sh/book/thinking_in_nu.html
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    https://www.nushell.sh/commands/docs/return.html