[flohofwoe]

It's not quite as clear-cut, some stdlib modules take an allocator when an 'object' is created (containers mostly work like this), others on each function call that needs to allocate (but crucially, one way or another, an allocator needs to be passed in).

In any case it's not nearly as limiting as the 'red-blue' async-await color split in other languages, and I can't think of a single downside of explicitly passing allocators into stdlib modules instead of having a hidden global allocator.

The approach to always pass allocators isn't all that Zig specific either, it's also a good library design practice in pretty much all other languages which allow explicit memory management.