Describe the bug

According to the standard the server should reply to a read of an array that defines AttributeIds.IndexRange with a sub array of the given range, however the server always replies with the full array.
see:
https://reference.opcfoundation.org/v104/Core/docs/Part4/7.24/
https://reference.opcfoundation.org/v104/Core/docs/Part4/7.22/

To Reproduce

1. create a server providing an array
2. create a client that reads the Value attribute of the array giving also IndexRange attribute with a valid range

Expected behavior

Client receives an array that matches the requested range

Screenshots

Version

Python-Version:3.8

opcua-asyncio Version (e.g. master branch, 0.9):at least 0.8.2 and above

Check the server and client in the attachment.
indexrange_issue.zip

I have identified a potential solution by changing:

• server/address_space.py::AttributeService::read()
• server/address_space.py::AddressSpace::read_attribute_value()