docs: static boolean shouldCheckFieldPresenceToEmulateJspbNullability(FieldDescriptor desc) {
      boolean hasBrokenSemantics = false;
      if (desc.hasDefaultValue() || desc.isRepeated()) {
        return false;
      } else if (desc.getFile().getSyntax() == Syntax.PROTO3 || !hasBrokenSemantics) {
        // in proto3 or proto2 with non-broken semantics we only need to check for presence for
        // message typed fields.
        return desc.getJavaType() == JavaType.MESSAGE;
      } else {
        return true;
      }
    }