Description:
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I have a custom object implementation with its own read_property and write_property handlers where some properties are also objects.
Attemptying to write a property within the nested object when the nested object has not been previously accessed via read_property will cause a stdClass object to be invented and assigned to the property instead of calling read_property to get the underlying object.

If the the first access is a write to a property of a nested object, then read_property is not called for the nested object and a stdClass object is invented and assigned:
$obj->nestedObject->someProperty = someValue;
assert( 'stdClass' == get_class( $obj->nestedObject ) );

However, if the first access is a read then it all works fine:
$someValue = $obj->nestedObject->someProperty; // read_property is called for nestedObject
$obj->nestedObject->someProperty = someValue; // and now the write works

First performing any kind of read access allows this to work just fine.
E.g. this works
$obj->nestedObject;
$obj->nestedObject->someProperty = someValue;

Or this:
$avalue = $obj->nestedObject->someProperty;  // calls read_property on nestedObject
$obj->nestedObject->someProperty = someValue;

The problem only occurs when the very first access is a write to a properpty of the nested property.