title: Rmarkdown PDF won't render less than equal to U+2264
body: <p>So, here's the problem, I want to knit this to a PDF:</p>
  
  <pre><code>---
  title: "Render"
  output: 
    html_document: default
    pdf_document: 
      latex_engine: xelatex
    word_document: default
  ---
  ## R Markdown
  
  Test ≤
  </code></pre>
  
  <p>If I knit to HTML, this works. If I knit to PDF using xelatex, the ≤ is blank. Any idea how to fix this? Is this a font issue?</p>