As it stands, there are no type restrictions in the API. I can see a couple of different type restriction options. First, a natural type constraint would be that every element in a column is of the same type. Whether that type is prescribed a priori could be up to the user.
At a minimum, it would be useful to do the following:
Allow specifying per column type constraints
Specify a default column type (to be used when a per column type is not provided)
Check that each row after the first conforms to the types of the columns in the first row
As it stands, there are no type restrictions in the API. I can see a couple of different type restriction options. First, a natural type constraint would be that every element in a column is of the same type. Whether that type is prescribed a priori could be up to the user.
At a minimum, it would be useful to do the following: