queryset-rf does not always honor cache

[lars@…]

Playing around in the shell and watching postgresql.log I found out the following:

Method a)

list = Article.objects.filter(idgt=130).order_by('-id')[0:2]
list[0] # Performs SQL query with LIMIT 1
list[1] # Performs another SQL query with LIMIT 1 OFFSET 2

Method b)

list = Article.objects.filter(idgt=130).order_by('-id')[0:2]
list # Performs an SQL query with LIMIT 2
list[0] # Hits the cache
list[1] # Hits the cache

Calling list[0] afterwards will invoke the SQL query with LIMIT 1

Calling list[1] after this will invoke another query with LIMT 1 OFFSET 1

b) Calling just "list" afterwards first and then calling list[0] and list[1]

will honor the cache and therefore only one SQL query gets fired.