[core] Do not InspectMembers() for stdlib types:

This prevents TClass getting confused about normalized names in std::
which will likely be implementation details

core/meta/inc/TDictionary.h

@@ -193,6 +193,9 @@ class TDictionary : public TNamed {
    static TDictionary* GetDictionary(const char* name);
    static TDictionary* GetDictionary(const std::type_info &typeinfo);
 
+   /// Return `true` if the TClass representd a name in the `std::` namespace.
+   Bool_t IsInStdLib() const { return Property() & kIsDefinedInStd; }
+
    // Type of STL container (returned by IsSTLContainer).
    enum ESTLType {
       kNone              = ROOT::kNotSTL,

core/metacling/src/TCling.cxx

@@ -2661,16 +2661,11 @@ void TCling::InspectMembers(TMemberInspector& insp, const void* obj,
       return;
    }
 
-   static const TClassRef clRefString("std::string");
-   if (clRefString == cl) {
-      // We stream std::string without going through members..
+   if (cl->IsInStdLib() && strncmp(cl->GetName(), "unique_ptr<", 11) != 0)
+      // We stream std::string and friends without going through members.
+      // `CloseStreamerInfoROOTFile()` needs to know the internal structure
+      // of std::unique_ptr.
       return;
-   }
-
-   if (TClassEdit::IsStdArray(cl->GetName())) {
-      // We treat std arrays as C arrays
-      return;
-   }
 
    const char* cobj = (const char*) obj; // for ptr arithmetics