Make sure `data` is in the right format and complain if it is not. Then, add a `taxon_id` column to data with the same length as the input
init_taxmap_data(self, data, input_ids, assume_equal = TRUE)
A `data` variable with the right format
The newly created [taxmap()] object
The `data` variable passed to the `Taxmap` constructor
The taxon IDs for the inputs that made the taxonomy
If `TRUE`, and a data set length is the same as the `input_ids` length, then assume that `input_ids` applies to the data set as well.