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So should I infer that the only reason UTF-8 is mentioned is that the reader APIs do not let you select the codec? Or is even that provided in which case it is accurate to say that Arc supports Unicode-in-general?

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Arc uses MzSchemes reader (it modifies the readtable slightly to support []-syntax). AFAIK you cannot access the reader API from inside Arc. The reason Utf-8 is mentioned is that it is the default encoding when MzScheme reads or writes files or streams.

I don't think anyone at this point would claim that Arc supports unicode-in-general.

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