Worked on the aws-actions/amazon-ecs-deploy-task-definition repository to deliver a feature that preserves empty or null-valued keys during ECS task definition deployments. Addressed the need for deployment fidelity by introducing a keep-null-value-keys input, allowing users to specify which keys should retain empty values rather than being removed by default. Updated the core cleaning logic, input schema, and documentation to support this enhancement, ensuring that configuration drift is minimized and deployment consistency is maintained. Utilized JavaScript and Node.js within the context of AWS ECS and GitHub Actions, focusing on improving reliability for users managing complex deployment configurations.