Unicode string while grabbing grain

{% set microcode = salt['grains.filter_by']({
  'Debian': {
    'pkgs': ['intel-microcode', 'amd64-microcode'],
  },
  'RedHat': {
    'pkgs': ['microcode_ctl'],
    'service': 'microcode',
  },
  'FreeBSD': {
    'pkgs': ['devcpu-data'],
    'sources': [{'devcpu-data': 'http://www.somesite.com/o1/fbsd/' ~ grains.get('osmajorrelease', '') ~ '/devcpu-data-1.7.txz'}],
    'service': 'microcode_update',
  },
}, grain='os_family') %}

The sources for FreeBSD comes out as:

{'devcpu-data': u'http://blahblah.com/devcpu-data-1.7.txz'}