The query comparison operators have a handled case for NaN

This behavior is not aligned with the Comparison Aggregation Operators and provides different result when used i.e. in $match pipeline stage or in a $project stage.

Query : src/mongo/db/matcher/expression_leaf.cpp

// Special case handling for NaN. NaN is equal to NaN but
// otherwise always compares to false.

Pipeline: src/mongo/db/pipeline/value.cpp

return compareInts(rL._storage.intValue, rR._storage.intValue);