[sameerihs]

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• Describe the purpose for which you created this PR.
• Create test code that corresponds to the modification

Fixes #419.

Adding a line comment with WithComment to an empty sequence emits
items # comment: [], putting the mapping delimiter and value inside the
comment. Explicit flow-style sequences have the same problem.

Attach these comments to the sequence so its existing renderer places them
after ]. Extend Test_WithCommentOption with empty slices, nil slices,
empty arrays, flow sequences and a block-sequence control. The tests check
exact output and decode it back to the expected value. Four cases fail before
the fix; all five pass afterward.

Validation with Go 1.24.4 on macOS arm64:

• make test, make simple-test, make lint with pinned golangci-lint 2.1.2,
  make fuzz and make cover.
• Ycat build/smoke test, playground dependency installation and Go/WASM,
  TypeScript and Vite builds.
• Root go vet ./..., formatting and diff checks.
• Linux/386 and Windows/386 test binaries cross-compile; they were not executed.

An additional vet run including ./testdata reports seven existing unkeyed
MapItem literals, reproduced on unchanged upstream. The playground build used
Node 26 rather than CI's Node 20; the full CI platform/version matrix remains
unverified locally.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.66%. Comparing base (edee2f9) to head (8c3a913).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #992   +/-   ##
=======================================
  Coverage   80.65%   80.66%           
=======================================
  Files          22       22           
  Lines        6845     6847    +2     
=======================================
+ Hits         5521     5523    +2     
  Misses        905      905           
  Partials      419      419           

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