Fix chain comparison bug and add tests #1170

	name: Go Fuzz

	on:
	push:
	branches:
	- main
	pull_request:
	merge_group:
	types:
	- checks_requested

	jobs:
	fuzz:
	name: go-fuzz
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version: '1.22'
	- name: Fuzz
	env:
	FUZZTIME: 30s
	GOGC: '100'
	run: make fuzz
	- name: Upload fuzz failure seed corpus as run artifact
	if: failure()
	uses: actions/upload-artifact@v4
	id: testdata-upload
	with:
	name: testdata
	path: '**/testdata/fuzz'
	- name: Output message
	if: failure()
	shell: bash
	run: \|
	echo -e 'Fuzz test failed on commit https://github.com/${{ github.repository }}/commit/${{ github.event.pull_request.head.sha }}. To troubleshoot locally, use the GitHub CLI to download the seed corpus by running:\n $ gh run download ${ github.run_id } -n testdata\nAlternatively, download from:\n ${{ steps.testdata-upload.outputs.artifact-url }}'
	- name: Post PR comment
	uses: actions/github-script@v7
	if: failure() && github.event_name == 'pull_request'
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	script: \|
	github.rest.issues.createComment({
	issue_number: context.issue.number,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: 'Fuzz test failed on commit ${{ github.event.pull_request.head.sha }}. To troubleshoot locally, download the seed corpus using [GitHub CLI](https://cli.github.com) by running:\n```shell\ngh run download ${{ github.run_id }} -n testdata\n```\nAlternatively, download directly from [here](${{ steps.testdata-upload.outputs.artifact-url }}).'
	})

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