Interval.unionImpl

union of two regions specifically computes the convex hull of the two intervals if Intervals don't overlap returns the init Interval

https://en.wikipedia.org/wiki/Convex_hull

Thanks Arne! https://forum.dlang.org/post/duzdclxvvrifoastdztv@forum.dlang.org

struct Interval(CoordSystem cs)
@safe nothrow pure @nogc
unionImpl

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