ish). The implementation here, that merges new
   defaults with passed-in options, is necessary since the property
   <code>Map.options</code> is private and so not directly accessible.
      </p><span class="label">Parameters</span>
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="20px"></td><td><code><span class="label">options</span>:<a href="MapOptions.html">MapOptions</a></code> &mdash; Instance of MapOptions that overrides the defaults
      used to initialize the map; or <code>null<