let rect = CGRect(x: 100.33333333333333333333333, y: 0, width: 100, height: 100) let infinite = CGRect.infinite 
let intersection = infinite.intersection(rect) 
print(infinite.contains(rect)) // true 
print(intersection == rect) // false

public func intersection(_ r2: CGRect) -> CGRect {
    if self.isNull || r2.isNull { return .null }

    let rect1 = self.standardized
    let rect2 = r2.standardized

    let rect1SpanH = rect1.minX...rect1.maxX
    let rect1SpanV = rect1.minY...rect1.maxY

    let rect2SpanH = rect2.minX...rect2.maxX
    let rect2SpanV = rect2.minY...rect2.maxY

    if !rect1SpanH.overlaps(rect2SpanH) || !rect1SpanV.overlaps(rect2SpanV) {
        return .null
    }

    let overlapH = rect1SpanH.clamped(to: rect2SpanH)
    let overlapV = rect1SpanV.clamped(to: rect2SpanV)

    let width: CGFloat
    if overlapH == rect1SpanH {
        width = rect1.width
    } else if overlapH == rect2SpanH {
        width = rect2.width
    } else {
        width = overlapH.upperBound - overlapH.lowerBound
    }

    let height: CGFloat
    if overlapV == rect1SpanV {
        height = rect1.height
    } else if overlapH == rect2SpanH {
        height = rect2.height
    } else {
        height = overlapV.upperBound - overlapV.lowerBound
    }

    return CGRect(x: overlapH.lowerBound,
                  y: overlapV.lowerBound,
                  width: width,
                  height: height)
}