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Given an x-monotone curve xcv and an enumeration ce
that specifies either the minimum or the maximum end of the curve,
determines the location of the curve end along the x-dimension.
The variable xcv identifies the parametric curve
C(t) = (X(t),Y(t)) defined over an open or half-open interval with
endpoints 0 and 1. The enumeration ce identifies an open
end d ∈ {0,1} of C. Formally, determines whether
lim t → d X(t) evaluates to bl, br, or a value
in between, where bl and br are the x-coordinates of the
left and right boundaries of the parameter space, respectively.
Returns ARR_LEFT_BOUNDARY, ARR_RIGHT_BOUNDARY, or
ARR_INTERIOR, accordingly.
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