Undefined optional fields

[Mvwivs]

Having fields with undefined values in retrieved objects is redundant.
For example in some cases getting objects with PropertyShapeSchema will return:

{ // ...
datatype: undefined,
description: undefined,
maxCount: 1,
minCount: undefined,
name: undefined,
nodeKind: undefined,
order: undefined,
path: "jsld:birthDate",
shapeModifiability: undefined,
valueModifiability: undefined,
}

Is there any reason to have these fields? Extracting missing fields and fields with value undefined is sort of equivalent