Truthiness of numbers is completely random

[Ten0]

Using Try.jsonata.org, on the default Invoice template and adding a "cancellation" number field only to the first order object, and filtering on the truthiness of that number:

As you can see that is completely random.
One would expect 0 to be "falsy" and everything else to be "truthy", like in every other language.

It seems to behave fine for true/false/null/""/"foo"/{}...