Replace dataclasses with attrs and slotted classes#976
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Signed-off-by: Sergey Vasilyev <nolar@nolar.info>
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In preparation for further refactoring for proper time handling — so that this single change would be tested in all Python versions.
Besides, attrs produces the slotted classes by default, which is good for memory footprint, especially on the frequently used classes like
HandlerState,Outcome, etc.In all other aspects, it is essentially a drop-in replacement with some minor changes.
The
attrsdependency is already installed for one of the sub-dependencies, so nothing new is essentially added to the deployment.