The method Value::compare in src/mongo/db/pipeline/value.cpp states :

    switch (lType) {
        // Order of types is the same as in BSONElement::compareElements() to make it easier to
        // verify.

Although it presents the case NumberDecimal before case NumberInt whereas it should be located after case NumberDouble to match src/mongo/bson/bsonelement.cpp.

This does not have any impact but just matches the explicit comment. Or else, just remove the comment if this is not of importance.