groupr 0.1.0 (in development)

• S3 class igrouped_df which describes a grouping that can be inapplicable

• Function group_by2() to create igrouped_df groupings

• S3 methods ungroup(), format(), group_data() for igrouped_df

• Function pivot_grps() for pivoting data using a group framework

• Functions colgrp(), infer_colgrps(), and sep_colgrp() for column grouping

• introduction vignette