Usage/Docs Clarity for re-using animations in series

[ghost]

I've just been playing around with Motion UI for an upcoming internal training session for our move back to Foundation 6. One thing I'm noticing is that I have a block of code like this:

@include mui-series {
  .card-inner { @include mui-queue(2s, 2s, slide($direction: right)); }
  .card-img { @include mui-queue(1s, 0s, fade); }
  .card-title { @include mui-queue(1s, 2s, slide($direction: right)); }
  .card-text { @include mui-queue(2s, 0s, fade, spin($direction: ccw), slide($direction: up)); }
}

The lines to note are the .card-inner and .card-title which are using the same animation, just staggered slightly apart. When I look at the compiled css, I'm seeing this:

.card-inner {
  -webkit-animation-name: slide-in-right-100;
          animation-name: slide-in-right-100;
  -webkit-animation-duration: 2s;
          animation-duration: 2s;
  -webkit-animation-delay: 0s;
          animation-delay: 0s; }

@-webkit-keyframes slide-in-right-100 {
  0% {
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%); }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0); } }

@keyframes slide-in-right-100 {
  0% {
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%); }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0); } } 

and then about 20 lines below:

.card-title {
  -webkit-animation-name: slide-in-right-100;
          animation-name: slide-in-right-100;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-delay: 5s;
          animation-delay: 5s; }

@keyframes slide-in-right-100 {
  0% {
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%); }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0); } }

Is there a reason this is being duplicated? The third slide-in-right-100 seems like it shouldn't be there considering it already exists above. I hesitate to call this a bug, because an extra 7 lines in a css file is not a big deal, but it seems like this should be done.

However, the main reason I'm posting this issue is to find out if there is a better way using motion-ui to re-use animations inside of a series-based functionality like this? The docs are good for basic functionality, but get a little bit hazy when you're trying to do more robust animation work. From looking at the source it doesn't look like I can pass an already-created keyframe animation in?