missing sorting direction for list datatypes

[ael-code]

the __list_place function exposed by the list datatype module allow to use the linked list as an ordered queue. The problem is that is not specified anywhere which is the sort direction.

Reading the code I concluded that:
element are sorted in increasing order from head to tail.
head -> min value
tail -> max value

[alessandropellegrini]

This is true that it's not specified, and it's true as well that elements are sorted increasingly.
There is no actual need to alter the ordering direction, as you have both head and tail, and you can navigate in both directions.
Could it be solved only by documenting this feature?