BoundType
Indicates whether an endpoint of some range is contained in the range itself ("closed") or not ("open").
Closed = 3
Both endpoints are considered part of the set.
LeftClosed = 1
The left endpoint value is considered part of the set: [X, Y)
Open = 0
Both endpoints are not considered part of the set: (X, Y)
RightClosed = 2
The right endpoint value is considered part of the set: (X, Y]