Cards in .card-deck do not always have same width

Created by: paradite

This is with respect to bootstrap v4. Here is a link to reproduce the issue: http://paradite.github.io/d3card/

By clicking the buttons to change to font size of the card-title, the cards will either have equal width or unequal width. I believe the correct behaviour should be that cards always have equal width.

A possible reason may be due to the image size, but then again the whole point of the card deck is to dynamically fit the image into the cards and fit the cards into the screen I believe.

OS: OS X 10.11.3 Browser: Chrome 49.0.2623.87