When using a number as an argument to an operator that would otherwise require a string, you can use the number directly. Compare

...-join'0'

vs.

...-join0

Works with -split as well.

When using a number as an argument to an operator that would otherwise require a string, you can use the number directly. Compare

...-join'0'

vs.

...-join0

Works with -split as well. The argument is always converted to a string first.