Changes

A return value of <code>()</code> from <code>map:get</code> could indicate that the key is present in the map with an associated value of <code>()</code>, or it could indicate that the key is not present in the map. The two cases can be distinguished by calling <code>map:contains</code>.

Invoking the <em>map</em> as a function item has the same effect as calling <code>get</code>: that is, when <code>$map</code> is a map, the expression <code>$map($K)</code> is equivalent to <code>get($map, $K)</code>. Similarly, the expression <code>get(get(get($map, 'employee'), 'name'), 'first')</code> can be written as <code>$map('employee')('name')('first')</code>.

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