I create a class with a checkbox datatype with default value "checked".
I create a package of the class that I want to import in some other ez installations
When I import the package the class is created but the default value "checked" is lost.

The exported package seems ok, the default value in lost during package import process:

<attribute datatype="ezboolean"
required="false"
searchable="true"
information-collector="false"
translatable="true">
<remote>
<id>456</id>
</remote>
<name>spunta</name>
<identifier>spunta</identifier>
<placement>1</placement>
<datatype-parameters>
<default-value is-set="true" />
</datatype-parameters>
</attribute>