I as a user would like to use multiple functions which accept '_.' as the iterating value nested.
Currently you cannot for example use a filter with a nested map function, as the '_.' in the filter function will overwrite the '_.' in the map function.
Therefore I would like the option to use an alias for each nested function, or some other solution which gives the desired outcome.
An example using suggested alias method to iterate over a nested list:
["eq", "foo", "alias_b.key"],
This would make it easier to write DTL because we would not have to define a rule for each nested expression which uses the '_.' operator.
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