@std/yaml parses yaml with anchor wrong about deno_std

[taind772]

I think the wrong part is merging.
Support or not, the output doesn't make sense to me at all. If merging is not supported, at least we should return something like

{
  test: { a: 2, b: 4, c: 6 },
  another: { "<<": { a: 2, b: 4, c: 6 }, c: 8, d: 10 }
}

I found a workaround (for my use case) by using https://www.npmjs.com/package/yaml instead:

import * as yaml from "npm:yaml"

const sample = `
test: &test
    a: 2
    b: 4
    c: 6
another:
    <<: *test
    c: 8
    d: 10
`
console.log(yaml.parse(sample, { merge: true }))