Fixes column matching on first field

[archilex]

Proposed changes

Currently the first field can never be matched due to array_search returning 0 as the key which is then interpreted as falsish. This is mentioned in the PR that added this feature.

This PR changes the check from != to !== so that the first array key of 0 isn’t interpreted as false.

Types of changes

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore

Checklist

• [ ] I have read the CONTRIBUTING doc
• [ ] I have signed the CLA
• [x] Lint and unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments