code: protected final AbstractConfigValue peekAssumingResolved(String key, Path originalPath) {
          try {
              return attemptPeekWithPartialResolve(key);
          } catch (ConfigException.NotResolved e) {
              throw ConfigImpl.improveNotResolved(originalPath, e);
          }
      }
docs: This looks up the key with no transformation or type conversion of any
  kind, and returns null if the key is not present. The object must be
  resolved along the nodes needed to get the key or
  ConfigException.NotResolved will be thrown.
  
  @param key
  @return the unmodified raw value or null