Generally speaking, formats are dispatched according to the type of value
returned by the "skimmer," i.e. summary function. One special formatting
"type" exists for the names of the returned vector. The names are used
to assign the levels for statistics that have more than one value. Counts
and quantiles are common cases.
When a vector is named, the name and the value are combined into a single
formatted value. To deal with excessively long names for factor levels,
only the first three characters of the name are returned by default. This
can be changed by setting a new value for max_char
within the
.levels
type.