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@throttle() raises TypeError when called with a timedelta argument

@throttle() raises TypeError when called with a timedelta argument: a task in Repo2RLEnv R2E-Gym / SWEGEN (Harbor dataset). When using the @throttle() decorator with a timedelta object as the period argument, it raises a TypeError at decoration time instead of working correctly.

The task

When using the `@throttle()` decorator with a `timedelta` object as the period argument, it raises a `TypeError` at decoration time instead of working correctly.

Part of FineEnvs/repo2rlenv-r2e-gym.