Prepare a mask to do masking
vector or object that can be converted to a vector
NULL or vector of logical elements
if new_mask is numeric than threshold at this level
Intended as a function called by
Ensures that input
new_mask is a vector of logicals for masking.
orig_mask is specified, then this implies that
will be masking an object later that has already been masked. The
can then be either the same length as
orig_mask or the length of the
number of TRUE elements in
vector of logicals
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