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# OpenSSLError.underlyingError(_:)

Reserved for surfacing errors from the underlying OpenSSL C API.

```
case underlyingError(String)
```

## Discussion

Not produced by any shipping code path. Once future APIs start
invoking the provider layer, this case will carry the string
produced by `ERR_error_string_n` so callers can log the exact
upstream reason. Today it exists solely to preserve API stability
across that transition.