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Patrick Labatut authored
Summary: Annotate the (return type of the) following dunder functions across the codebase: `__init__()`, `__len__()`, `__getitem__()` Reviewed By: nikhilaravi Differential Revision: D29001801 fbshipit-source-id: 928d9e1c417ffe01ab8c0445311287786e997c7c
64289a49
