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The major dimension of the values.
For output, if the spreadsheet data is: `A1=1,B1=2,A2=3,B2=4`, then requesting
`range=A1:B2,majorDimension=ROWS` will return `[[1,2],[3,4]]`, whereas requesting
`range=A1:B2,majorDimension=COLUMNS` will return `[[1,3],[2,4]]`.
For input, with `range=A1:B2,majorDimension=ROWS` then `[[1,2],[3,4]]` will set
`A1=1,B1=2,A2=3,B2=4`. With `range=A1:B2,majorDimension=COLUMNS` then `[[1,2],[3,4]]` will set
`A1=1,B1=3,A2=2,B2=4`.
When writing, if this field is not set, it defaults to ROWS.