'YAML/yamljs string deserialization behaviour

I was testing YAML (yamljs) with random inputs (please don't ask why it's a long story :D). I'm not very well versed in the YAML spec, but as far as I understand YAML should be able to serialize and deserialize primitives (strings, numbers, booleans) without an object or array wrapper. This however doesn't always seem to be the case.

I isolated one failing case:

import YAML from 'yamljs'

describe('YAML', () => {
  it('should be equal to the input', () => {
    const str = '0xn5t'
    expect(YAML.parse(YAML.stringify(str))).toBe(str)
  })
})

Where it '0xn5t' is somehow parsed back to 5

Expected: "0xn5t"
Received: 5

Could someone please guide me to the spec where this behaviour is explained? Could this be an issue with the library I'm using?

javascript yaml

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'YAML/yamljs string deserialization behaviour

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