DumpCols returns column.Cols that are used for this type (regardless if the column has a valid value or not).

DumpStruct dumps the structure into a rowData map based on the sheet:"..." struct tag.

DumpUID extracts the UID value from the struct, if it is not configured it will use the left-most value, it dumps the value even if the uid col is marked read-only.

DumpUIDCol is the same as DumpUID but with the column itself.

LoadIntoStruct returns an error only if the supplied data (coming from sheets) is not valid for the type in the struct.