But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
Pulse-Code Modulation (PCM) — MDN Web Docs
，这一点在夫子中也有详细论述
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Lets you test multiple ideas in a single experiment instead of having to perform many individual tests over a long period