bind_rows and bind_cols should preserve type of first input #1692
Description
i.e. if it's a data frame, the output should be data frame, if it's a tbl_df the output should be a tbl_df, if it's grouped the output should be grouped
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i.e. if it's a data frame, the output should be data frame, if it's a tbl_df the output should be a tbl_df, if it's grouped the output should be grouped