The maintainer seems unreachable.
Many issues and pull requests have been submitted over the years without any response.
Consider switching to the actively maintained yaml-rust2 fork of the original project:
yaml-rust2
{ "license": "CC0-1.0" }
{ "affects": { "functions": [], "os": [], "arch": [] }, "affected_functions": null }
{ "informational": "unmaintained", "categories": [], "cvss": null }