Eliot Miranda-2 wrote
> Is that character code legal unicode?

No, but that turned out to be a red herring!

This simple experiment seems to show a fundamental problem when serializing
in 4.0 (non-spur) and materializing in 5.0 (spur):

  FileStream forceNewFileNamed: filename do: [:aFile |
    FLSerializer newDefault
        serialize: ($e) on: aFile binary ] .

  FLMaterializer materializeFromFileNamed: filename.

Doing the serialization and materialization in the same 4.0 image works, but
materializing in a 5.0 image throws an error (a different one this time -
"MessageNotUnderstood: receiver of ""adaptToNumber:andSend:"" is nil")

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