The source/binarysource are clob/blob fields and don't have a 2000 character limit. You mention the AUTOSCRIPT field, which is the name of the automation script and has a 100 character limit out of box. Not sure if that was a typo or not. But we have scripts with over 50,000 characters without issue. The SOURCE field is similar to long description where there isn't a practical limit.
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Steven Shull
Director of Development
Projetech Inc
Cincinnati OH
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