  <tr><td>Dictionary</td> <td>Table</td> <td>Struct</td></tr>
    <tr><td>Bytes</td> <td>Buffer</td> <td>String (Symbol, Keyword)</td></tr></table><p>Indexed types are linear lists of elements than can be accessed in constant time
with an integer index.  Indexed types are backed by a single chunk of memory for
fast access, and are indexed from 0 as in C.  Dictionary types associate keys
with values. The difference between dictionaries and indexed types is that
dictionaries are not limited to integer keys. T