[ejstembler]

I'm surprised the author doesn't go into deeply nested maps and deep merges. That's an issue none of the languages solves natively.

[badestrand]

PHP is the only language compared in the article that natively provides this:

"PHP also includes a functionality in its standard library that none of the other languages here do: deep merging. array_merge_recursive will recursively call merge on string key collisions."