janhoy commented on PR #4786:
URL: https://github.com/apache/solr/pull/4786#issuecomment-5373234912

   > RE clone: why? Can we instead stop/prevent re-use, by adding a boolean 
like `_used`
   
   The clone is what lets `builder(JettyConfig other)` snapshot the builder 
without the
   field-by-field copy factory — a `_used` flag wouldn't remove that need, and 
would ban
   the build-a-base-config-then-tweak pattern the copy factory exists for.
   
   You're right about the shallow maps though (an aliasing that predates this 
PR).
   Pushed a fix: `clone()` now deep-copies both maps, and the built config 
exposes them
   via `Collections.unmodifiableMap`. Repeated `build()` and copied builders 
are now
   fully independent.


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