API Subscriptions XML Response Change

As of July 13, 2020, the XML response for reading multiple subscriptions has changed. Before, dates and integers with no value still displayed a type:

<trial-started-at type=\"datetime\" nil=\"true\"/>
<next_product_id type="integer" nil="true"/>

Now, the type will no longer be returned for a nil field.

<trial-started-at nil=\"true\"/>
<next_product_id nil="true"/>

This same change was made when reading a single subscription in 2018.