near-sdk (Rust) 4.0.0-pre.3

This release comes with a few very minor API changes but also some new features. For up-to-date changes, see CHANGELOG.

4.0.0-pre.3 [10-12-2021]

• Introduce #[callback_result] annotation, which acts like #[callback] except that it returns Result<T, PromiseError> to allow error handling. PR 554
  • Adds #[callback_unwrap] to replace callback
• mock: Update method_names field of AddKeyWithFunctionCall to a Vec<String> from Vec<Vec<u8>>. PR 555
  • Method names were changed to be strings in 4.0.0-pre.2 but this one was missed
• env: Update the register used for temporary env methods to u64::MAX - 2 from 0. PR 557.
  • When mixing using sys and env, reduces chance of collision for using 0
• store: Implement caching LookupMap type. This is the new iteration of the previous version of near_sdk::collections::LookupMap that has an updated API, and is located at near_sdk::store::LookupMap. PR 487.
  • The internal storage format has changed from collections::LookupMap so the type cannot be swapped out without some migration.
• store: Implement caching UnorderedMap type. PR 584.
  • Similar change to LookupMap update, and is an iterable version of that data structure.
  • Data structure has also changed internal storage format and cannot be swapped with collections::UnorderedMap without manual migration.