takes a function and returns a boolean indicating whether its output gets assigned a class.
The body of
func is search for one of three idioms:
class(output) <- classes
attr(output, "class") <- classes
If either is found, the assigned class (or classes) are returned as the
classes attribute of the output. If none are found, a value of
FALSE is returned (with no attributes).
a boolean. If the return value is
TRUE the boolean has
classes which returns the (potential) classes for the
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