If there is no documentation of the format, is there any chance that I could get my hands on a list of available fields (and the values that they can take)?
Essentially, I would need all the fields that are not RStudio-specific, and looking at e.g., https://github.com/r-lib/devtools/blob/master/devtools.Rproj, it looks like no field is really specific to RStudio (except EnableCodeIndexing and BuildType, although I still plan on using the former).
Or is the devtools.Rproj "complete" (i.e., it has all the potential options)?
Since the field names are pretty self explanatory, I think that just having their possible values would be more than enough.
PS: UseSpacesForTab does not look like an integer.