This could be useful in verifying the sheet data, and also can be used for caching API row lookup.
Right now the column API returns items->field, items->dataType, etc… Along with that, if it could compute and return another items->dataHash, with a hash value (say sha512) of all cellData in that column.
For example, in a sheet like this,
A B C
1 abc def ghi
2 jkl mno pqr
items->dataHash could return {items: [{“field” : “A”, … “dataHash”: hash(‘sha512’, A1.A2) },…]} which would be hash of concatenated string “abcjkl”.