has_rownames: Check whether or not a data-frame-like object has rownames
Description
Check whether or not a data-frame-like object has rownames
Usage
has_rownames(df)
Value
Logical indicating if df has rownames. If df is a tibble,
returns FALSE. If df is a data.frame, return FALSE if the rownames
are simply row numbers. If the rownames are anything other than the
return row numbers, returns TRUE.