TanStackOSS
    table
    fix(table-core): preserve undefined in DeepValue for optional deep keys When a deep string accessor key traverses an optional (or nullable) parent key, `DeepValue` dropped the `undefined` from the resolved value type. This made `getValue()` for a path like `user.salary.amount` typed as `number` even when `salary` is optional, hiding a possible `undefined` that the runtime accessor (which uses optional chaining) can return. Distribute over the leaf union and map `null`/`undefined` members to `undefined`, matching the optional-chaining semantics of the deep accessor function.
    nx affected --targets=test:eslint,test:sherif,test:knip,test:lib,test:types,test:build,build --parallel=4
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