Should I create functions for packages/libraries that allow optional parameters to accept null as a value?

Should I create functions for packages/libraries that allow optional parameters to accept null? In this example below, I set the 3rd and 4th parameter as `null` which will act as the default value. ``` myLibrary::myFunction(1, 7, null, null, true); ``` Or is this not a good way to go about creating functions for a package and therefore should not accept `null` as a parameter value. ``` myLibrary::myFunction(1, 7, false, 4, true); ```