currently in a `dataclasses.dataclass` based class, you can either have it
hashable and completely immutable (using frozen=True and eq=True), or you can
have it hashable but completely mutable (by using unsafe_hash=True)
unsafe_hash provides the convenience of being able to mutate some fields, while
computing your hash by other, non-mutable fields. But there is nothing
enforcing the fact that the fields marked with `hash=True` should stay
immutable, otherwise it completely breaks hashability.
The suggestion is, for the dataclass to throw an error if you try to mutate a
field that contributes to the hash of that dataclass. Or, to have a flag that
allows you to do so.
Suggestions for the flag name could be
@dataclass(freeze_hashable_fields=True)
class A:
...
or
@dataclass(frozen_hash=True)
class A:
...
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