Currently, the golden test output is serialized using JSON.stringify() here and here.

However, the error output produced when a reconstruction assertion fails is serialized with tojson(). The two serializers can render the same value differently, which makes it harder to correlate a failed test run against the pre-existing golden test output files.

One example of this is how an invalid new Date(NaN is handled:

MongoDB Enterprise > const date = new Date(9223372036854775807);
MongoDB Enterprise > tojson(date)
ISODate("0NaN-NaN-NaNTNaN:NaN:NaNZ")

MongoDB Enterprise > JSON.stringify(date)
null

This discrepancy made debugging SERVER-127282 tricky.