This works with ember-cli-fastboot 1.0.0-beta.19 but is broken in 1.0.0-rc.1
Example to reproduce:
$ ember new head-bug-example && cd head-bug-example
$ npm install fastboot@1.0.0-rc.6 --save-dev
$ npm install ember-cli-fastboot@1.0.0-rc.1 --save-dev
$ npm install ember-cli-meta-tags@3.1.0 --save-dev
$ ember serve
This now throws a type error on boot TypeError: _ember.default.$ is not a function at Object.initialize ... instance-initializers/browser/head.js:14:1
Looks like something is loading the browser instance initializer in the fastboot env?