new_partial() when constructing a new partial type subclass;
is_partial() to test if a type is partial. All subclasses
need to provide a
new_partial(..., class = character()) is_partial(x) vec_ptype_finalise(x, ...)
Attributes of the partial type
Name of subclass.
As the name suggests, a partial type partially specifies a type, and
it must be combined with data to yield a full type. A useful example
of a partial type is
partial_frame(), which makes it possible to
specify the type of just a few columns in a data frame. Use this constructor
if you're making your own partial type.
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