[Pharo-project] Prune stack serialization

Hi folks In Fuel, we serialize a block closure with its state, including its outerContext. This enables to serialize a sorted collection with its sortBlock: | bytes result | bytes := FLSerializer serializeToByteArray: (SortedCollection sortBlock: [:a :b | a > b ]). result := FLMaterializer materializeFromByteArray: bytes. result addAll: #(1 2 3); yourself. ---> a SortedCollection(3 2 1) Here the problem: the byte array is huge! (800kb) because we are serializing unneeded context for the sort block. We wonder how to prune it and save time and space. Thanks in advance Martín