v0.5.0

Added

• Merge(base, dropins...) — computes the effective configuration of a
  unit combined with its drop-ins per systemd.unit(5): drop-ins apply in
  order as if appended, and an empty assignment resets every earlier
  occurrence of that option across same-named sections. Duplicate
  sections are never collapsed, and inputs are not modified.
• Unit.Values(section, option) — every occurrence of an option across
  all same-named sections, in order of appearance.

v0.4.0

Breaking changes

• Deserialize now rejects assignments (or any non-comment text) that
  appear before the first section header with
  ErrAssignmentOutsideSection, matching systemd. Previously such text
  was silently discarded.

Added

• Unit.Value(section, option) — one-call lookup that treats duplicate
  sections as one merged section with last-assignment-wins semantics,
  as systemd does.
• Unit.String() — the canonical serialized form, implementing
  fmt.Stringer.
• Testable examples (ExampleDeserialize, ExampleUnit_Value,
  ExampleUnit_WriteTo) rendered on pkg.go.dev.
• Real-world fixtures under testdata/ (services, sockets, netdev,
  network, mount, timer, daemon configs, drop-ins, CRLF) with golden
  round-trips and expected-value tests.
• Fuzzing in CI: a 15-second smoke run on every push/PR and a nightly
  10-minute run; the fuzzer is now also seeded with every testdata
  fixture.

Changed

• The lexer is synchronous: the goroutine/channel pipeline inherited from
  go-systemd/unit is gone. This removes a latent goroutine leak on
  early-error returns and makes Deserialize ~2.2x faster
  (63.6µs → 29.3µs, 2000 → 1804 allocs/op on the parser benchmark).
• go.uber.org/goleak (test-only dependency) now fails the suite if any
  test leaks a goroutine.
• README: removed the Go Report Card badge (the service is retired) and
  updated the usage example to Unit.Value. CI now authenticates codecov
  uploads (CODECOV_TOKEN), unsticking the stale coverage badge.
• Coverage gate ratcheted from 80% to 90% (the suite sits at ~96%).