Yep, neither the name nor what little documentation there is a are really helpful, and that looks to be a long-standing issue (https://github.com/ziglang/zig/issues/3049).

Seems to me like this allocator should be renamed something like "FixedBufferBumpAllocator", which:

- leaves room for other fixed-buffer allocators (e.g. bitmap, slabs)

- spell out that there's something of note about the allocator, whose drawbacks the developer either would already be aware of or would be able to look up easily