"message": "Amount must be non-zero."
Browse the implementors of #beVariable message and you will find other filters under BPatternVariableNode class, such as #beInstVar or #beLocalVar. If you miss something, just add a method. No new syntax required.
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“短短一周，连着两次诈骗，我意识到诈骗团伙可能已经盯上我妈了。”龙先生告诉记者，母亲年纪大了，听力不太好，说话需要很大声，所以母亲虽然在隔壁打电话，他听得很清楚。
Вашингтон Кэпиталз
The same issues exist on the WritableStream side. A WritableStream has a highWaterMark and desiredSize. There is a writer.ready promise that producers of data are supposed to pay attention but often don't.