# Prefer Unstructured Storage for Upgradeable Contracts Linear storage, which is the default way to manage storage variables, is intuitive but has limitations. When combined with inheritance, it requires us to maintain the well-known (and some would say infamous) [`__gap` array](https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable#storage-gaps). Managing this array increases complexity and makes audits more challenging. A proposed alternative is to use [EIP-7201](https://eips.ethereum.org/EIPS/eip-7201) storage slots, which can offer greater flexibility. However, this approach should be used with caution: variable names should be uniquely chosen and consistently referenced. Utilizing [spelling checkers](https://github.com/optimumsec/the-complete-guide-to-securing-web3-protocols/blob/main/coding/use-spelling-checkers.md) can help maintain naming consistency and reduce potential issues. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.optimumsec.xyz/coding/unstructured-storage.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.