This is the `tinylib/msgp` repository, a high-performance MessagePack serialization library for Go with an integrated code generation tool. The actual system consists of two layers: a runtime library in the `msgp/` package providing buffered readers/writers, zero-copy byte slice operations, and interfaces like `Marshaler`/`Unmarshaler`; and a code generator (`main.go`, `gen/`, `parse/`) that produces optimized, reflection-free serialization methods from Go structs and directives. The architecture is a combination of a CLI tool (for `//go:generate` workflows) and a library that the generated code depends on. Key entry points include the `Run()` function in `main.go` for code generation, and the `Reader`/`Writer` types for runtime I/O. External dependencies are minimal: `philhofer/fwd` for buffered I/O and `golang.org/x/tools` for code formatting. The library supports advanced features like shims, type replacement, omitempty/omitzero, limits, generics, and set types. The codebase is well-structured, with extensive tests and benchmarks, and demonstrates sophisticated engineering in code generation and serialization performance.