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FeedParserDict. contains breaks backward compatibility with "updated" and "updated parsed" keys

FeedParserDict. contains breaks backward compatibility with "updated" and "updated parsed" keys: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). The contains method in FeedParserDict has been completely rewritten, which breaks backward compatibility with the…

The task

The `__contains__` method in `FeedParserDict` has been completely rewritten, which breaks backward compatibility with the "updated" and "updated_parsed" keys. Previously, there was special handling for these keys to maintain backward compatibility as noted in issue 310 and 328.

Part of keryszhan/harbor-swesmith-rl-artifacts.