[libcxx-commits] [libcxx] [libc++][hardening] Finish documenting hardening. (PR #92021)

[Mark de Wever via libcxx-commits]

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@@ -29,8 +29,11 @@ modes are:
   rigour impacts performance more than fast mode: we recommend benchmarking to
   determine if that is acceptable for your program.
 - **Debug mode**, which enables all the available checks in the library,
-  including internal assertions, some of which might be very expensive. This
-  mode is intended to be used for testing, not in production.
+  including heuristic checks that might have significant performance overhead as
+  well as internal library assertions. This mode should be used in
+  non-production environments (such as test suites, CI, local development). We
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mordante wrote:

I would expect an `or` here.
```suggestion
  non-production environments (such as test suites, CI, or local development). We
```

https://github.com/llvm/llvm-project/pull/92021