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go-config/docs/asr/ASR-0005-multi-source-deep-merge-semantics.md
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eSliderandCursor c575341178 feat(go-config): multi-format codecs, envc CLI, fixtures, ASRs 
- Module github.com/eslider/go-config with env/yaml/json/ini packages
- internal: source, keymap, merge, structconv, bytesutil
- cmd/envc: convert, get, merge
- docs/asr ASR-0001..0008, README/CHANGELOG/AGENTS refresh
- golangci-lint v2 config; tests + fixtures

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-02 14:04:01 +01:00

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ASR-0005: Multi-source deep-merge semantics

Context

Layered configuration (defaults file < local overrides < process environment) requires predictable composition rules.

Decision

  1. Sources are applied in option order (left → right). Each source parses to a map[string]any, then merge.DeepMerge folds them.
  2. Maps recurse — nested keys are unioned; existing nested maps are not replaced wholesale by a sibling scalar.
  3. Scalar leaves use last-write-wins (later source wins).
  4. Slices default to merge.Replace; WithSliceMerge(merge.Concat) appends prior and new slice elements.

Consequences

  • Env files and WithCurrentEnvironment() compose when ordered lowest → highest priority.
  • Tests lock behaviour via fixtures/merge/*.

Status

Accepted — 2026-05-02.

References

  • ASR-0003
  • internal/merge
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