It reads
Optionally, a named list providing a function that will be applied to the
valuein each cell in the output. You will typically use this when the combination ofid_colsandvaluecolumn does not uniquely identify an observation.
I believe it should be
Optionally, a named list providing a function that will be applied to the
valuein each cell in the output. You will typically use this when the combination ofid_colsandnamecolumn does not uniquely identify an observation.
Am I right?