Thanks for your input Maxim.

However either I still do not get the purpose of the zone key or I am
missing something in the whole reasoning...
Isn't it the zone key there to isolate requests from different sources and
thus avoid collisions in the same cache path?
The only case favorable for collision is, as you explained, when the same
cache path *and* the same zone key are being used.

If I am correct, why not allowing the same cache path to be used, provided
the zone key is *always* different on each call of *_cache_path?
---
*B. R.*
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