This is a very similar issue as what is mentioned here: http://stackoverflow.com/questions/18390947/data-table-of-table-is-very-different-from-data-frame-of-table

yet this pertains to creating data.tables using a list input. For example:

### Data.frame takes in a list of 3 3x3 matrices, and creates a 3x9 data.frame.
data.frame(replicate(3, matrix(rnorm(9), nrow = 3)))

### Data.table takes in the same list, and creates a 27x1 data.table.
data.table(replicate(3, matrix(rnorm(9), nrow = 3)))

I discovered this behavior at least a year ago when I was trying to create a data.table object using mget

a <- letters
b <- LETTERS
vars <- c("a", "b")

### Works
data.frame(mget(vars))

### Doesn't work
data.table(mget(vars))

There are probably really good reasons for having this behavior that I am not aware of as a user, but at the same time it would be great to have data.table behaving as similarly as possible to data.frame!

Thanks for such a great package! I haven't used data.frame in years, and couldn't be happier.