Hey all 
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0.57.0 was released yesterday evening which now gives more detailed st.cache error messages to help with debugging. Also, as of 0.57.0, Streamlit now natively supports types re.pattern @knorthover and bytesIO/stringIO 
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Going forward, if anyone comes across a “Cannot hash object of type _____” error message and needs help, please provide the full error message available on 0.57.0. Feel free to let us know if you have any questions and we’ll message the thread when we have more updates!