 class='st'>"middle"</span>,
  <span class='kw'>sep_out</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>unique_sep</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>empty_fill</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>prefix</span> <span class='kw'>=</span> <span class='st'>""</span>, <span class='kw'>postfix</span> <span class='kw'>=</span> <span class='st'>""</span>)

<span class='fu'>to_title_case</span>