booltypes ranks the boolean types.
An object of class
ordered (inherits from
factor) of length 6.
There are currently six boolean types,
booltypes is an
ordered vector with the following ordinal
for representing any boolean data including
for representing dense boolean data
for representing sparse (skewed) boolean data
for representing sparse boolean data with few
range-indexing, for representing sparse boolean data with a single range of
booltypes has a
names attribute such that elements can be selected by name.
do not rely on the internal integer codes of these levels, we might add-in
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