Is the IMF concerned about bitcoin in El Salvador?

Could you elaborate on the IMF's stance towards Bitcoin in El Salvador? Are they expressing any concerns or reservations about the country's decision to adopt Bitcoin as legal tender? Are there any potential risks or challenges that the IMF perceives in this move, and how might they impact the country's financial stability and economic growth? Additionally, what measures, if any, has the IMF suggested to mitigate these risks and ensure a smooth transition for El Salvador's economy?