I'm porting some apps that were using simple image-based persistence
(ReferenceStream) from 1.3 to 1.4.

The first thing that I ran into was FS class name changes (e.g. FSReference
-> FileReference). Since the class wasn't present, I got an errorKeyNotFound
[1]. Naively tried:

� �Smalltalk globals
� � � �at: #FSReference put: FileReference;
� � � �at: #FSFilesystem put: FileSystem;
� � � �at: #FSAbsolutePath put: AbsolutePath;
� � � �at: #FSUnixStore put: UnixStore.

But got "primitive #primGetPosition: in MultiByteFileStream failed" from
ReferenceStream>>next

I have a few ideas, but has anyone gone successfully through this type of
process before? What's my best bet? I've been following Fuel and STON (which
is quite nice for parsing json from REST APIs b.t.w.), but I'm not clear if
either would be helpful here.

What do you suggest?

Thanks,
Sean

[1] Stack trace (heavily snipped)
SystemDictionary(Dictionary)>>errorKeyNotFound:
� � � �Receiver: a SystemDictionary(lots of globals)
� � � �Arguments and temporary variables:
� � � � � � � �aKey: � #FSReference
� � � �Receiver's instance variables:
� � � � � � � �tally: �2920
� � � � � � � �array: �an Array(#MemoryHandle->MemoryHandle nil nil
#BlockClosuresTestCase->Blo...etc...
� � � � � � � �cachedClassNames: � � � nil
� � � � � � � �cachedNonClassNames: � �nil

...

ReferenceStream(DataStream)>>readInstance
� � � �Receiver: a ReferenceStream
� � � �Arguments and temporary variables:
� � � � � � � �instSize: � � � 2
� � � � � � � �aSymbol: � � � �#FSReference
� � � � � � � �refPosn: � � � �50
� � � � � � � �anObject: � � � nil
� � � � � � � �newClass: � � � nil
� � � �Receiver's instance variables:
� � � � � � � �byteStream: � � MultiByteFileStream: '/Volumes/Sean''s
Universe/sean/.jenkins/jobs/...etc...
� � � � � � � �topCall: � � � �nil
� � � � � � � �basePos: � � � �0
� � � � � � � �references: � � an IdentityDictionary()
� � � � � � � �objects: � � � �an IdentityDictionary(0->#(nil) 5->a Resources 10->#Resources
21->an O...etc...
� � � � � � � �currentReference: � � � 55
� � � � � � � �fwdRefEnds: � � an IdentityDictionary()
� � � � � � � �blockers: � � � an IdentityDictionary()
� � � � � � � �skipping: � � � an IdentitySet()

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