Excel Lambda function to stack two arrays vertically

appendrangev.txt

//from <https://exceljet.net/formula/lambda-append-range>
//stack arrays vertically
APPENDRANGEV = LAMBDA(range1, range2, default,
    LET(
        rows1, ROWS(range1),
        rows2, ROWS(range2),
        cols1, COLUMNS(range1),
        cols2, COLUMNS(range2),
        rowindex, SEQUENCE(rows1 + rows2),
        colindex, SEQUENCE(1, MAX(cols1, cols2)),
        result, IF(
            rowindex <= rows1,
            INDEX(range1, rowindex, colindex),
            INDEX(range2, rowindex - rows1, colindex)
        ),
        IFERROR(result, default)
    )
);