query posts - Use union/intersection query_posts variables in uri request parameter form? in WordPress

WP_Query uses PHP's native parse_str function, which uses the following structure to denote arrays:

'post__not_in[]=1&post__not_in[]=2&post__not_in[]=3'

is the same as

array( 'post__not_in' =>
 array( 1,2,3 )
)