Github user cestella commented on the issue:
https://github.com/apache/metron/pull/687
well, `:=` is in the shell and also in the enrichment configuration (see
[here](https://github.com/apache/metron/tree/master/metron-platform/metron-enrichment#stellar-enrichment-configuration).
Seems like if we're promoting this to the language, we should make things
consistent in one way or the other.---
