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All functions

collapse_by_keys()
Collapse duplicate key groups, concatenating selected columns and replacing other divergences with NA
collapse_candidates()
Extract original rows from key groups where concatenation would be required
collapse_concat_only()
Collapse data and keep only key groups where concatenation occurs
collapse_no_concat()
Collapse data and keep only key groups where no concatenation is needed
keep_number_or_na()
Keep a single number from a string, otherwise return NA
na_if_single_lt100()
Replace single integers strictly below 100 with missing values
normalize_num_list()
Normalize a number list stored as a character string