Since when do we have UpdateSourceTrigger = PropertyChanged in Silverlight 4?

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I'm developing in Silverlight 4 and in time I got used to having two choices for the UpdateSourceTrigger property of bindings: Default and Explicit. But today I found out I can also choose "PropertyChanged", which is very, very welcome but... unexpected. In the properties of my project I can still see "Silverlight 4" but somehow I get to successfully use a Silverlight 5 feature... Does anyone have an explanation for this?

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