When I use targets: "> 0.25%, not dead" for the "polyfill-corejs3" plugin, I get an error: Invalid Option: '0' is not a valid target. This also happens when I pass an array (even though I am not sure if this is allowed anyway.

Passing an object works { firefox: 43 }. Why is a string not working?

Also: I noticed, that my compiled file is still full of code which doesnt fit the target e.g. this one:

	// Thank's IE8 for his funny defineProperty
	var descriptors = !fails(function () {
	  return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] != 7;
	});

I thought the goal of babel-polyfills is to get rid of all this?
Atm, the compiled file is actually bigger than what I had before.