For wifi observer responses the fields lat, lng, x and y are typed as floats (decimals), but they are returning NaN in certain cases. NaN isn’t valid JSON (https://tools.ietf.org/html/rfc8259 sec 6) and should probably be changed to null. Not a big deal but obviously causes an exception which has to be handled if you’ve typed the field to float in the class you deserialize into.
Thanks