plugin transform-es2015-modules-umd fails with Babel 6

I think this is a bug.

The code indicated here: https://github.com/babel/babel-standalone/pull/92

Fails with Babel 6:

<html>
<head>
  <title>Babel Test</title>
</head>
<body>
  <script type="application/javascript" src="https://unpkg.com/babel-standalone@6.26.0/babel.js"></script>
  <script  data-plugins="transform-es2015-modules-umd" data-module="cube" type="text/babel">
    export default function cube(x) {
      return x * x * x;
    }
  </script>
  <script data-plugins="transform-es2015-modules-umd" type="text/babel">
    import cube from 'cube'
    console.log(cube(3))
  </script>  
</body>
</html>

This seems related to Babel 6 treating exports as per the ES6 spec

Inline Babel script (2):3 Uncaught TypeError: (0 , _cube2.default) is not a function at :24:36 at :10:9 at :13:3 at run (babel.js:61531) at check (babel.js:61597) at loadScripts (babel.js:61638) at runScripts (babel.js:61668) at transformScriptTags (babel.js:336) at babel.js:327 (anonymous) @ Inline Babel script (2):3 (anonymous) @ VM6913:10 (anonymous) @ VM6913:13 run @ babel.js:61531 check @ babel.js:61597 loadScripts @ babel.js:61638 runScripts @ babel.js:61668 transformScriptTags @ babel.js:336 (anonymous) @ babel.js:327

babel / babel-standalone

plugin transform-es2015-modules-umd fails with Babel 6 #100