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Ben Boeckel authored
The 0.9 release adds support for tagged values. Since the core `yaml-rust` crate doesn't support them, they are instead smuggled through using a hash with two keys to carry the tag and value separately. This does mean that there could be values which turn into tagged values when round-tripping, but the hashes must meet the exact requirements which is considered to be suitable. Also updates the minimum Rust to 1.56 to support the 2021 edition used in the now-minimum `lazy_static`. Fixes: #6
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