v3.9.1

Upgrade priority: Low.

• Important The Result<T, E> has been updated in the generation and the base types to follow the Rust version 100%. This means {as, is}Error is now available as {as, is}Err on the Result type. The older versions can still be used, but the *Error interfaces are now marked as deprecated.

Changes:

• Adjust Result<T, E> interface to be 100% compatible with the Rust version
• Add the 2028 upgrade to the known upgrades (optimizing certain .at queries)
• Adjust council derives to cater for latest Substrate & Polkadot
• Adjust Rococo know type definitions to cater for the latest update
• Update types for latest Polkadot/Substrate
• Add generic arguments for TypeScript users to .entries/.keys to deal with the key typings