There's a of of alternative methods to achieve the same objective (look at the number of different methods to set a cell value, for example).
This isn't an internal method because it's perfectly acceptable for userland coding to access it; though the basic setFormatCode() mthod is more flexible because you can use it to set any numberformat mask, whether built-in or not.
This isn't an internal method because it's perfectly acceptable for userland coding to access it; though the basic setFormatCode() mthod is more flexible because you can use it to set any numberformat mask, whether built-in or not.