Internal generic lengths.sq does not dispatch properly

[DominikRafacz]

Calling lengths(sq) results in calling default implementation of lengths instead of method lengths.sq. lengths is not a common generic function, but an internal generic, which may be the reason why it fails to work correctly.

[DominikRafacz]

The reason for it is simple: lengths is, indeed, internal generic method, but in S4, not S3. S4 method should be written in order to reach expected behaviour.

[DominikRafacz]

fixed in 05ccecd

[DominikRafacz]

Even after implementing S4 method, it does not dispatch as expected, contrary to common sense. Temporary solution is our own function get_sq_lengths() implemented in 63739a3

[ErdaradunGaztea]

Might want to read this paper, especially chapter 5. Not sure if this helps, but it's worth reading.