LOOK WHAT I MADE THE OTHER MONTH!!!

Code:
alias c {
  if ($1 isnum) { 
    if ($2) { return  $+ $1 $+ , $+ $2 | goto end }
    if ($1) { return  $+ $1 }
    :end
  }
  if $1 === b return 
  if $1 === u return 
  if $1 === o return 
  if $1 === r return 
  if $1 === n return 
  else { return }
}

We don't just write the scripts, we put them to the test! (ScriptBusters)