types%feat!: use little-endian byte arrays instead of n-endian hex-encoded strings for machine-readable formats, expand trait implementations

[kwvg]

Motivation

As pointed out in a comment in rust-dashcore#1056, rust-dashcore's codec helpers distinguish between human-readable and machine-readable types, a distinction that dash-types erroneously does not make, leaving simple storage optimisations on the table.

This pull requests repairs that and related nitpicks.

Additional Information

• This pull request breaks existing binary-formatted files but since we don't have any committed to tree, no migration code has been included.

Breaking Changes

Refer to changelogs.

How Has This Been Tested?

./contrib/git_filter.py --fast-fail develop rdc_equi -- bash -c 'cargo clippy --all-targets --no-default-features -- -D warnings && cargo clippy --all-targets --features full -- -D warnings && cargo test --all-targets --features full && ./maint/lint_all.py'

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

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Run ID: f5766f34-0fee-4c56-a6b2-244f446da316

📥 Commits

Reviewing files that changed from the base of the PR and between 4bd3b2a and bda98f8.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (8)

• pkgs/p2p_core/src/command.rs
• pkgs/pkc/src/ecdsa/public_bytes.rs
• pkgs/primitives/src/types/addrv1.rs
• pkgs/types/CHANGELOG.md
• pkgs/types/Cargo.toml
• pkgs/types/src/entity.rs
• pkgs/types/src/hex.rs
• pkgs/types/src/serialize.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• pkgs/types/CHANGELOG.md

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📝 Walkthrough

Walkthrough

Shared hex and serde utilities now distinguish human-readable formats from machine-readable formats. Numeric, cryptographic, and address types use these utilities or update their serde implementations. Tests add CBOR byte assertions and conversion checks.

Changes

Byte serialization and hex handling

Layer / File(s)	Summary
Shared byte and serialization behavior pkgs/types/Cargo.toml, pkgs/types/src/hex.rs, pkgs/types/src/lib.rs, pkgs/types/src/serialize.rs, pkgs/types/src/entity.rs, pkgs/types/src/secret.rs, pkgs/dev/Cargo.toml, pkgs/dev/src/encode.rs, pkgs/dev/src/lib.rs, pkgs/types/CHANGELOG.md	dash-types adds shared hex parsing and formatting, byte conversions, and serde adapters for human-readable text and machine-readable bytes. dash-dev adds and exports assert_cbor_raw.
Numeric hash serialization and error types pkgs/num/src/arith256.rs, pkgs/num/src/compact.rs, pkgs/num/src/hash.rs, pkgs/num/src/lib.rs, pkgs/num/src/util.rs, pkgs/num/tests/*, pkgs/num/CHANGELOG.md	Arith256 derives serde through Hash256. HashBlob uses shared formatting and serde helpers. ParseHexError now comes from dash-types and is no longer re-exported from dash-num. Tests check raw CBOR bytes for Hash256 and Arith256.
Cryptographic and address byte types pkgs/pkc/src/bls/*, pkgs/pkc/src/ecdsa/*, pkgs/pkc/src/eddsa/*, pkgs/primitives/src/types/addrv1.rs, pkgs/pkc/CHANGELOG.md	BLS, ECDSA, and AddrV1 serde handling is updated, with CBOR tests checking raw bytes. BLS slice-length tests are added. Two EdDSA array-to-newtype conversion implementations are removed.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to bda98

Large byte values remain decodable, and no actionable merge-blocking issue remains after normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 59.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 54 functions across 26 files. (2 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: machine-readable formats now use little-endian byte arrays, with expanded trait implementations. It is specific despite being longer than preferred.
Description check	✅ Passed	The description directly explains the motivation, breaking binary-format change, testing, and documentation updates for the changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 59.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 54 functions across 26 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@pkgs/types/src/serialize.rs`:
- Line 114: Update the deserialization path that calls deserialize_bytes to use
a byte-buffer path, and extend its Visitor to forward visit_byte_buf to the
existing byte conversion so large CBOR byte strings round-trip.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 0e4722ab-3766-420d-b490-8f0451377fc7

📥 Commits

Reviewing files that changed from the base of the PR and between 4754149 and 4bd3b2a.

📒 Files selected for processing (30)

• pkgs/dev/Cargo.toml
• pkgs/dev/src/encode.rs
• pkgs/dev/src/lib.rs
• pkgs/num/CHANGELOG.md
• pkgs/num/src/arith256.rs
• pkgs/num/src/compact.rs
• pkgs/num/src/hash.rs
• pkgs/num/src/lib.rs
• pkgs/num/src/util.rs
• pkgs/num/tests/hash.rs
• pkgs/num/tests/serde.rs
• pkgs/pkc/CHANGELOG.md
• pkgs/pkc/src/bls/ies_bytes.rs
• pkgs/pkc/src/bls/public_hash.rs
• pkgs/pkc/src/bls/public_ops.rs
• pkgs/pkc/src/ecdsa/public_bytes.rs
• pkgs/pkc/src/ecdsa/public_ops.rs
• pkgs/pkc/src/ecdsa/sig_bytes.rs
• pkgs/pkc/src/ecdsa/sig_ops.rs
• pkgs/pkc/src/ecdsa/sig_rec_bytes.rs
• pkgs/pkc/src/eddsa/public_bytes.rs
• pkgs/pkc/src/eddsa/sig_bytes.rs
• pkgs/primitives/src/types/addrv1.rs
• pkgs/types/CHANGELOG.md
• pkgs/types/Cargo.toml
• pkgs/types/src/entity.rs
• pkgs/types/src/hex.rs
• pkgs/types/src/lib.rs
• pkgs/types/src/secret.rs
• pkgs/types/src/serialize.rs

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