cf-agent quotting works with singe, double quotes, and backticks

quotetest.cf

neil@luna:~/.cfagent/inputs$ cat quotetest.cf 

body common control
{
	bundlesequence => { "main", };
}

bundle agent main {
   vars:
      'var1' string => 'with single quotes';
      "var2" string => "with double quotes";
      `var3` string => `with backticks`;

   reports:
      '${var1}';
      "${var2}";
      `${var3}`;
}

neil@luna:~/.cfagent/inputs$ cf-agent -Kf quotetest.cf 
R: with single quotes
R: with double quotes
R: with backticks