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Now users can do:\r\n\r\n`df = df.astype({'my_bool', 'bool', 'my_int': 'int'})`\r\n\r\nor:\r\n\r\n`df = df.astype({0, 'bool', 1: 'int'})`\r\n\r\ninstead of:\r\n\r\n```\r\ndf['my_bool'] = df.my_bool.astype('bool')\r\ndf['my_int'] = 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