Custom name for current value as a function parameter

Suggestion Box
1

CurrentValue in loops such as Filter and FormulaMap/ForEach is a pain to use because we have to use WithName to be able to access the current value of a parent loop:

Table A.Filter(
     CurrentValue.WithName(
           ParentCurrentValue, 
           Table B.Filter(
                 CurrentValue.Prop=ParentCurrentValue.Prop
           )
     )
)

While the above example doesn’t make much sense and is just for illustration, there are many times I find myself trying to access a parent current value.

My suggestion is to add a new named or optional argument (so existing formulas are not broken everywhere) which can be used to set a custom name for the current value, something like: ForEach(List, CurrentValueName, Formula), and so the above example would become:

Table A.Filter(
    CurrentTableARow, 
    Table B.Filter(
         CurrentValue.Prop=CurrentTableARow.Prop
    )
)

With one level of nesting the difference is not very visible, but Coda formulas are already very verbose and any nesting that can be avoided is a “quality of life” improvement.