add empty / error header constructor, put u32::MAX as size for compac… · availproject/avail-core@498ab18

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/cache@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1, codecov/codecov-action@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/cache@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1, codecov/codecov-action@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Check Clippy: core/src/header/extension/mod.rs#L19

casting integer literal to `u8` is unnecessary

Check Clippy: core/src/data_lookup/mod.rs#L184

this expression creates a reference which is immediately dereferenced by the compiler

`avail-core` (lib) generated 2 warnings (run `cargo clippy --fix --lib -p avail-core` to apply 2 suggestions)

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The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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