Merge operator support?

[shimaowo]

From what I can tell, the merge operator << does not seem to have any support at all - it's just processed as a normal key and left to the user.

Is there any plan to ever support that? I realize it's technically not in the official spec and is instead part of a forever-unratified draft, but there is an absolute ton of yaml on the internet that uses it.

[Ethiraric]

It could be gated behind a feature flag, or a separate processing step like fn apply_merge_ops(v: &mut Yaml). I'm not opposed to having it as long as it is distinct from the rest of the parsing to preserve standard compliance.