Constructor for new rset objects
new_rset(splits, ids, attrib = NULL, subclass = character())
A list column of rsplits
or a tibble with a single column
called "splits" with a list column of rsplits
.
A character vector or a tibble with one or more columns that begin with "id".
An optional named list of attributes to add to the object.
A character vector of subclasses to add.
An rset
object.