r.js does not set define.amd during optimization

main.js

define([
	"myplugin!foo"
], function(result) {
	console.log("plugin result:", result);
});

myplugin.js

define(["plugindep"], function(dep) {
	return {
		load: function(name, parentRequire, load, config) {
			if(!dep) {
				console.log("It's broken :(");
				process.exit(-1);
			}
			else {
				load("It works.");
			}
		}
	}
});

plugindep.js

console.log("Has define():", !!define);
console.log("Has define.amd:", !!define.amd);

if(typeof define === "function" && define.amd) {
	define(function() {
		return {
			importantinfo: "Yep."
		}
	});
}