I'd move to use ToYAML framework if there were a way to emit comments.

[phadej]

Something of type

Node v -> (v -> [String]) -> ByteString

where v -> [String] argument would specify the "comments on top of node" would be great.

I have a messy implementation in https://github.com/haskell-CI/haskell-ci/blob/master/src/HaskellCI/YamlSyntax.hs#L181

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I'll probably move to use Node anyway at some point. But let's see when.