Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/687
POV issue I think. Stellar has the LANGUAGE ( grammar ), the default
implementation, and the 'host' execution mechanics.
`:=` is part of the host execution mechanics.
The issue may not be being the same as much as the necessity for `:=` as a
host construct at all if things are done inside stellar.
Does that make sense?
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