When using constructor promotion on a hydrated object the parameters of the constructor are also properties. This works fine in the ObjectHydrator code base but as soon as you start using other libraries that observe Attributes it can cause breakages.

In particular laminas-form can use an attribute builder to build out forms from objects but it's code naively looks at the properties of a class. If it comes across an Attribute it instantiates it but this fails if the Attribute is only registered as TARGET_PARAMETER.

It's a difficult one. Laminas-form shouldn't be so naive about what an attribute targets but also, in a property promotion world those targets will always be both a parameter AND a property so a library like this should also work with that.