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Declarative objects for FormEncode.
Declarative objects have a simple protocol: you can use classes in
lieu of instances and they are equivalent, and any keyword arguments
you give to the constructor will override those instance variables.
(So if a class is received, we'll simply instantiate an instance with
no arguments).
You can provide a variable __unpackargs__ (a list of strings), and if
the constructor is called with non-keyword arguments they will be
interpreted as the given keyword arguments.
If __unpackargs__ is ('*', name), then all the arguments will be put
in a variable by that name.
Also, you can define a __classinit__(cls, new_attrs) method, which
will be called when the class is created (including subclasses).
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For Declarative subclasses, this decorator will call the method
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