Expand the cases with default values
Arguments
- cases
A list of cases
- defaults
A list of default values
- post
A function for post-handling each case, returning the a list with the name and the case. One can also return multiple cases based on the demand. All cases returned will be finally merged.
- default_case
The name of the default case. If a function is provided, it will take the defaults as argument and return the name of the default case.