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@cachedmethod does not pass self to the key function

@cachedmethod does not pass self to the key function: a task in Repo2RLEnv R2E-Gym / SWEGEN (Harbor dataset). When using @cachedmethod with an explicit key argument, self is not passed to the key function. This causes two problems:

The task

When using `@cachedmethod` with an explicit `key` argument, `self` is not passed to the key function. This causes two problems:

Part of FineEnvs/repo2rlenv-r2e-gym.