yardstick_remove_missing(),  and yardstick_any_missing() are useful
alongside the metric-summarizers functions for implementing new custom
metrics. yardstick_remove_missing() removes any observations that contains
missing values across, truth, estimate and case_weights.
yardstick_any_missing() returns FALSE if there is any missing values in
the inputs.
yardstick_remove_missing(truth, estimate, case_weights)yardstick_any_missing(truth, estimate, case_weights)
Vectors of the same length.
A vector of the same length as truth and estimate, or
NULL if case weights are not being used.
metric-summarizers