TTF preload despite woff2 being available

[Munter]

On https://5ece67b9b98a6300076dd0c6--mntr.netlify.app/ javascript to preloading is referencing the Noto Serif__subfont italic variant in a TTF format.

<link rel="preload" as="font" type="font/woff2" crossorigin="anonymous" href="/subfont/Open_Sans-700-6dc750c288.woff2">
<link rel="preload" as="font" type="font/woff2" crossorigin="anonymous" href="/subfont/Noto_Serif-400-32cc1ee314.woff2">
<link rel="preload" as="font" type="font/woff2" crossorigin="anonymous" href="/subfont/Open_Sans-400-3683a41eea.woff2">
<link rel="preload" as="font" type="font/woff2" crossorigin="anonymous" href="/subfont/Noto_Serif-700-673f8434d8.woff2">
<script>
try {
  new FontFace(
    'Open Sans__subset',
    "url(/subfont/Open_Sans-700-6dc750c288.woff2) format('woff2'), url(/subfont/Open_Sans-700-21d7534bff.woff) format('woff')",
    { 'font-weight': 700 }
  ).load(),
    new FontFace(
      'Noto Serif__subset',
      "url(/subfont/Noto_Serif-400-32cc1ee314.woff2) format('woff2'), url(/subfont/Noto_Serif-400-bf5454c658.woff) format('woff')",
      {}
    ).load(),
    new FontFace(
      'Open Sans__subset',
      "url(/subfont/Open_Sans-400-3683a41eea.woff2) format('woff2'), url(/subfont/Open_Sans-400-feb5067747.woff) format('woff')",
      {}
    ).load(),
    new FontFace(
      'Noto Serif__subset',
      "url(/subfont/Noto_Serif-700-673f8434d8.woff2) format('woff2'), url(/subfont/Noto_Serif-700-31942be193.woff) format('woff')",
      { 'font-weight': 700 }
    ).load(),
    new FontFace(
      'Noto Serif__subset',
      "url('https://fonts.gstatic.com/s/notoserif/v8/ga6Kaw1J5X9T9RW6j9bNfFImajC-.ttf') format('truetype')",
      { 'font-style': 'italic' }
    ).load();
} catch (e) {}
</script>
<link rel="stylesheet" href="/subfont/fonts-b7005f3a36.css">

These were all default settings run on a page with a classic use of google fonts:

<link rel=stylesheet href="https://fonts.googleapis.com/css?family=Noto+Serif:400,700,400i|Open+Sans:700,400">

[papandreou]

Addressed by #97