Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/1064#discussion_r195931024
--- Diff: metron-stellar/stellar-common/README.md ---
@@ -54,6 +54,12 @@ The Stellar language supports the following:
* The ability to have parenthesis to make order of operations explicit
* User defined functions, including Lambda expressions
+### Boolean Expressions
+
+Similar to python and javascript, empty collections (e.g. `[]` and
--- End diff --
Missing variables vs. NULL variables... this may be confusing. What this
is saying is
we support
- boolean with true or false
- variables that are present but explicitly null or empty
- variables that are NOT present
---
