on each variable

things (currently only one thing)

changes to navalues. Sorted all files by ID.

Rf/sparse config

See merge request !11

against a threshold.

Rf/sparsity categorical nan

See merge request !10

data points, not the total number of data points, when they are specified as
proportions.

Bf/flatten hierarchical na

See merge request !9

Bf/non numeric

See merge request !8

np.unique, as the latter can bork with mixed type data (although I couldn't
reproduce the specific crash - perhaps it's np version specific)