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" }
{ "affected_functions": null, "affects": { "os": [], "functions": [], "arch": [] } }
{ "cvss": null, "informational": "unmaintained", "categories": [] }