Use rangeVersion indicating < instead of >

This should allow us to use firstGeq (which should be possible to make
more efficient), and generally make things nicer

Internal.h

@@ -393,18 +393,6 @@ struct ReferenceImpl {
     this->oldestVersion = oldestVersion;
   }
 
-  void printLogical(std::string &result) {
-    for (const auto &[k, v] : writeVersionMap) {
-      std::string key;
-      for (uint8_t c : k) {
-        key += "x";
-        key += "0123456789abcdef"[c / 16];
-        key += "0123456789abcdef"[c % 16];
-      }
-      result += key + " -> " + std::to_string(v) + "\n";
-    }
-  }
-
   int64_t oldestVersion;
   std::map<std::string, int64_t> writeVersionMap;
 };