v0.1.1

What's Changed

• Fix when map values that are set as nil deleted after deepcopy by @khlopkov in #13

New Contributors

• @khlopkov made their first contribution in #13

Full Changelog: v0.1.0...v0.1.1

v0.1.0

First release of golang.design/x/reflect — a generic DeepCopy for Go, the
external implementation of proposal go.dev/issue/51520.

import "golang.design/x/reflect"

dst := reflect.DeepCopy(src) // a fully independent copy

Features

• DeepCopy[T any](src T, opts ...DeepCopyOption) (dst T) recursively copies into
  a freshly allocated value: numbers, bools, strings, slices, arrays, maps,
  pointers, structs (including unexported fields), and interfaces.
• Circular and shared structures are handled, preserving the original pointer
  aliasing.
• Customization options for singletons and stateful objects (sync.Mutex,
  os.File, net.Conn, js.Value, ...):
  • WithCopyFunc[T](fn) — general per-type escape hatch; T may be concrete or an interface.
  • RetainType[T]() — share values of type T by reference.
  • ZeroType[T]() — substitute a fresh zero value (e.g. an unlocked mutex).
  • DisallowType[T]() — panic when a value of type T is encountered.
  • DisallowCopyUnexported(), DisallowCopyCircular(), DisallowCopyBidirectionalChan().

Notes

• Requires Go 1.18+ (generics).
• Copying unexported fields relies on the unsafe package.
• Deep copy is not free — roughly one allocation per copied element; prefer a
  hand-written copy on hot paths. See bench_test.go.
• This is a pre-1.0 release: the API may still change.