When marshal from an object, this library will generate sequences in following format:

--- m dump:
a: Easy!
b:
  c: 2
  d:
  - 3
  - 4

But according to yaml spec: https://yaml.org/spec/1.2/#id2797382

The format seems to be:

--- m dump:
a: Easy!
b:
  c: 2
  d:
    - 3
    - 4

Is there any background on this?