Notes #

• First 0.1.0 release of this package.

Features #

Implement solana_kit_codecs_core and solana_kit_codecs_numbers packages, ported

from @solana/codecs-core and @solana/codecs-numbers in the TypeScript SDK.

solana_kit_codecs_core provides the foundational codec interfaces and utilities:

• Sealed class hierarchy: Encoder<T>, Decoder<T>, Codec<TFrom, TTo> with fixed-size and variable-size variants
• Composition utilities: combineCodec, transformCodec, fixCodecSize, reverseCodec, addCodecSentinel, addCodecSizePrefix, offsetCodec, padCodec, resizeCodec
• Byte utilities: mergeBytes, padBytes, fixBytes, containsBytes
• Assertion helpers for byte array validation
• 135 tests covering all codec operations

solana_kit_codecs_numbers provides number encoding/decoding:

• Integer codecs: u8, i8, u16, i16, u32, i32, u64, i64, u128, i128
• Float codecs: f32, f64
• Variable-size shortU16 codec (Solana compact encoding)
• Configurable endianness (little-endian default, big-endian option)
• BigInt support for 64-bit and 128-bit integers
• 152 tests including exhaustive shortU16 roundtrip validation

Initial scaffold for 18 core packages forming the foundation and middle layers of

the Solana Kit dependency graph. Each package has its pubspec.yaml with correct workspace dependencies, shared analysis_options.yaml, and an empty barrel export file ready for implementation.

Package groups scaffolded:

• Crypto & Identity: addresses (base58), keys (Ed25519), signers (interfaces)
• Codecs: core interfaces, numbers, strings, data structures, umbrella re-export
• Utilities: functional (pipe/compose), options (Rust-like Option codec), fast_stable_stringify, subscribable (reactive patterns)
• Transaction Building: instructions, instruction_plans, transaction_messages, transactions (compilation & signing)
• Other: offchain_messages, test_matchers

Fixes #

Enhance core SDK packages with additional functionality and tests.

• Codecs core: Enhanced addCodecSizePrefix with additional functionality
• Codecs data structures: Array codec improvements
• Codecs numbers: shortU16 codec enhancements
• Codecs strings: UTF-8 codec improvements
• Keys: Key pair and signatures enhancements
• RPC transport: HTTP transport and WebSocket channel updates
• Transactions: Transaction codec enhancements