How to unnest an array with element indexes

Given an array such as ARRAY[1.1,1.2], I need to select both values and
indexes, as follows:

1;1.1
2;1.2

The following query does what I want for a simple example:

with pivoted_array AS(
select unnest(ARRAY[1.1,1.2])
)
select ROW_NUMBER() OVER() AS element_index, unnest as element_value
from pivoted_array

Is ROW_NUMBER() OVER() guaranteed to always return array's index? If not,
how should I predictably/deterministically do it?

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