Translate:

document.A.Contains(c) 

to:

{ A : { $elemMatch : { $eq : c } } } 

instead of:

{ A : c } 

To prevent certain transformations that apply to `{ A : c }` (but not for this `Contains` case) from being applied.

During final rendering (when no further transformations to the AST will occur) the first from can be rendered as the second form.