Concatenate strings in $strings using $connective as a separator. Note that the order of the arguments was previously reversed. To cater for this, join will still work with the arguments reversed, but will print a warning message.
lowercase$str
convert the string to lowercase
pyFormatString$msg $args
Use python's % operator to format the string
split$string $separator
Split apart $string at every point that $separator occurs returning a list of strings