Randomly returns totally wrong values with Swift optimizations (-O) turned on

gistfile1.swift

public func optionalMax <T: Comparable>(elements: T? ...) -> T? {
	var maximumElement: T?

	for element in elements {
		if let element = element {
			if let existingMaximumElement = maximumElement {
				if element > existingMaximumElement {
					maximumElement = element
				}
			}
			else {
				maximumElement = element
			}
		}
	}

	return maximumElement
}