╰─❯ open test.nu
def main [
  word:string
  --option (-o):string=''
  --flag (-f)
] {
  print $'word=($word) option=($option) flag=($flag)'
}

╰─❯ nu test.nu hello -f -o '1'
Error: nu::parser::type_mismatch

  × Type mismatch during operation.
   ╭─[<commandline>:1:1]
 1 │ main hello -f -o 1
   ·                  ┬
   ·                  ╰── expected string, found number-like value (hint: use quotes or backticks)
   ╰────

╰─❯ nu test.nu '1' -f -o '1'
Error: nu::parser::type_mismatch

  × Type mismatch during operation.
   ╭─[<commandline>:1:1]
 1 │ main 1 -f -o 1
   ·      ┬
   ·      ╰── expected string, found number-like value (hint: use quotes or backticks)
   ╰────