A wrapper for a Python generator that ensures all returned items are unique

unique.py

import dill
import mmh3
import typing
import io


def hash_object(o: typing.Any) -> str:
    with io.BytesIO() as buffer:
        dill.dump(o, buffer)
        return mmh3.hash_bytes(buffer.getvalue(), x64arch=True)


def unique(items: typing.Iterable) -> typing.Iterable:
    seen_items = set()
    for item in items:
        hash = hash_object(item)
        if hash not in seen_items:
            seen_items.add(hash)
            yield item