This is a generic definition that can be extended according to class. This function and methods should do "deep" copy for archiving purposes.

.addTagsToOutput(object, outputObjects, FUN, preDigestByClass)

# S4 method for ANY
preDigestByClass)
object Any R object. Optional character vector indicating which objects to return. This is only relevant for list, environment (or similar) objects A function A list, usually from .preDigestByClass