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Comment by kortex | Hacker News Reader

Wait, really? scrambles to check woah...

I've never seen typed yaml, this is wild.

    negative: !!int -12
    zero: !!int 0
    positive: !!int 34

Can't say I love the notation, but indeed that is type annotations. I guess neither "yaml type hints" nor "yaml type annotations" are the right query. Had to search explicitly for "yaml tags".

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The neat thing is that you can use tags to represent custom data structures or functions. For example, AWS Cloudformation uses YAML tags as a shorthand for template functions [0].

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGui...

Depending on the parser you can also use them to call arbitrary code. This used to be the default behavior of `pyyaml.load`.

Types are !!screaming at reader. Don't want to start blameshitting, but is yaml supposed to be a simple human-readable format?

It is screaming with double negations!

It's not screaming without double negations!!

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