bizdays comes with builtins calendars:
load_builtin_calendars()
Has no return
- actual - weekends - Brazil/ANBIMA - Brazil/B3
This function creates and registers these calendars. Once the calendars are loaded they can be used directly by their names.
This function is called in package `.onAttach`, so it is not necessary to call it directly. It is for internal use, package development or in situations where the user wants to call bizdays functions without attach the package.