d align="left"><code>vctrs::partial_factor(letters)</code></td>
<td align="left">prtl_fctr</td>
</tr>
<tr class="even">
<td align="left"></td>
<td align="left">vctrs_partial_frame</td>
<td align="left"><code>vctrs::partial_frame(a = 1)</code></td>
<td align="left">prtl</td>
</tr>
<tr class="odd">
<td align="left">Language objects</td>
<td align="left">function</td>
<td align="left"><code>function() NULL</code></td>
<td align="left">fn</td>
</tr>
<tr class="even">
<td align="left"></td>
<td align="left">symb