We were some of the issues associated with the behavior of arrays.
1. We would like to implement arrays negative indices (from the end) like in 
Python or Ruby: arr[-2]  or arr[1: -1] 
but as an array can be indexed in the negative area so it probably can not be 
2. We would like to add the ability be omitted boundaries in the slice.
Example: arr[2:] or arr[:2]. But there was a problem with the update of an 
empty array:
arr[1:][1:] = {1,2,3,4,5,6} can be interpreted as 
arr[1:3][1:2] or arr[1:2] [1:3] or [1:1], [1:6]

What is the history of the emergence of such arrays? Maybe something can be 

P.S. I would like List datatype as in Python.  Is there any fundamental 
objections? Or we just did not have the time and enthusiasm before?
The current implementation I would call vectors or matrices but not arrays. 

YUriy Zhuravlev
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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