The json spec is not versioned. There were two changes to it in 2005 (the removal of comments, and the addition of scientific notation for numbers), but it has been frozen since — almost two decades now. The yaml spec on the other hand is versioned. The latest revision is fairly recent, 1.2.2 from October 2021. Yaml 1.2 differs substantially from 1.1: the same document can parse differently under different yaml versions. We will see multiple examples of this later.
Nici mie nu imi place yaml si in genere orice tehnologie care cere indentation. Parca si Python e la fel.