YAML Package as a codec?

[DartBot]

<img src="https://avatars.githubusercontent.com/u/3136967?v=3" align="left" width="96" height="96"hspace="10"> Issue by austincummings
Originally opened as dart-lang/sdk#21124

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Rather than having the loadYaml* functions in the yaml package, should the library be exposed via a Codec instead? This would then look the same as the JSON property in dart:convert.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1343914?v=3" align="left" width="48" height="48"hspace="10"> Comment by sgjesse

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Added Area-Pkg, Pkg-Yaml, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/444270?v=3" align="left" width="48" height="48"hspace="10"> Comment by seaneagan

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dupe of issue dart-lang/sdk#12098

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<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Added Duplicate label.
Marked as being merged into dart-lang/sdk#12098.