<span class='kw'>.i</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='no'>origin</span>, <span class='no'>destination</span>), <span class='kw'>.t</span> <span class='kw'>=</span> <span class='no'>insert_date</span>, <span class='kw'>.d</span> <span class='kw'>=</span> <span class='fl'>0</span>,
    <span class='kw'>.resolve</span> <span class='kw'>=</span> <span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'><a href='