What is the difference between cv2.resize() and imutils.resize()?

edit

imutils.resize() evaluate width only but not height. Imutils never used height all times. While OpenCV used both width and height or either height or width. Here is imutils.py:

def resize(image, width = None, height = None, inter = cv2.INTER_AREA):
    # initialize the dimensions of the image to be resized and grab the image size
    dim = None
    (h, w) = image.shape[:2]
    # if both the width and height are None, then return the original image
    if width is None and height is None:
        return image
        # check to see if the width is None
        if width is None:
            # calculate the ratio of the height and construct the dimensions
            r = height / float(h)
            dim = (int(w * r), height)
        # otherwise, the height is None
        else:
            # calculate the ratio of the width and construct the dimensions
            r = width / float(w)
            dim = (width, int(h * r))
        # resize the image
        resized = cv2.resize(image, dim, interpolation = inter)
        # return the resized image
        return resized

if i understand it correctly, imutils.resize() only tries to evaluate either the width or height argument, and tries to preserve the original aspect ratio of the image, while cv2.resize() gives you a free choice (w/o any constraints)