update_call: Update a call
In LAJordanger/leanRcoding: Leaner R Coding

The function modify_call in the pryr-package does not always do as I expect when used inside of a function, so this modified version of update_formals has been used in order to get stuff to work in a way I better understand. This approach seems to be a bit saffer in those cases where it's desired that the value NULL should be used as an argument.

1	update_call(.call, ..., .list = FALSE, .ignore = NULL)

`.call`	The call we want to update.
`...`	`dotsMethods`, the arguments to be used for an update of the formals of `.fun`. If the arguments of interest already are stored in a list (or an environment), set the argument `.list` to `TRUE`.
`.list`	Logic value, default `FALSE`. This can be used when the stuff that we want to update with already is contained in a list or an environment. NOTE: Only the first argument given to `...` will in this case be recorded!
`.ignore`	Character vector, default value `NULL`. When the arguments we want to create our call are delivered in a list or an environment, this can be used to perform a partially update, i.e. give the names of the arguments we don't want to update (yet).