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Returns the number of elements in the Set.
$length
Returns either the number of elements in the Set, or Inf for infinite intervals. See cardinality in properties for the type of infinity.
Inf
cardinality
properties
Other set accessors: class(), elements, lower, max(), min(), properties, range(), traits, type, universe, upper
class()
elements
lower
max()
min()
range()
traits
type
universe
upper