Restore type checking for functions decorated with @lru_cache
#1596
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There is an issue with mypy when using the
@lru_cachedecorator that causes function parameters to not be type-checked. For the most part, we're migrating MF to use our customLruCacheclass, but for those cases where we still use the decorator (or until we migrate all of them to the new class), this ensures they will be type checked.