Use of CellMatrix and purpose of adding cells int it 🧐 ?

[dumbbellcode]

Hi, community 👋,
I was just going through the source of exceljs and observed that we are creating a matrixMap(object where each key has value of type CellMatrix) separately while setting Defined Names when reading a workbook.

I am unable to understand why we are adding cells in CellMatrix for a Defined Name ?.

Thank You.