The idea of `decorator_factory` is to eliminate boilerplate code that used to
create a decorator with parameters.
A perfect example is how `dataclass` decorator can be simplified from this:
```
def dataclass(cls=None, /, *, init=True, repr=True, eq=True, order=False,
unsafe_hash=False, frozen=False):
def wrap(cls):
return _process_class(cls, init, repr, eq, order, unsafe_hash, frozen)
# See if we're being called as @dataclass or @dataclass().
if cls is None:
# We're called with parens.
return wrap
# We're called as @dataclass without parens.
return wrap(cls)
```
To this:
@functools.decorator_factory
def dataclass(cls, /, *, init=True, repr=True, eq=True, order=False,
unsafe_hash=False, frozen=False):
return _process_class(cls, init, repr, eq, order, unsafe_hash, frozen)
```
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