Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/718
Forgive my lack of understanding (possibly remembering?) of some of the
underlying Stellar assumptions, but it seems like we mix up the meaning of
actual null and String null. It may not be entirely reasonable, but I would
expect "null" to be an actual string null.
For example:
```
"better_title" : "title"
,"title" : "null"
```
There's no formatting or any other distinction between "title" and "null"
that would imply null is treated as a special case in string handling.
JSON has an actual null value that's not string null, and it seems like if
we're defining transforms in JSON that's how it should be handled, e.g.
```
"better_title" : "title"
,"title" : null
```
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