Hi.

I detect strange bug. Substitution Array class is not working. Try this:

s := ByteArray new writeStream.
serializer := FLSerializer newDefault.
serializer analyzer��
�� when: [ :o | o==Array ]��
�� substituteBy: [ :o | ��#instead ].
�� serializer serialize: {Array} on: s
.
s2 := s contents readStream.

object := (FLMaterializer newDefault materializeFrom: s2) root.

Interesting that other classes are working correctly.

I open issue��17669