You can think of BPatterns as a Smalltalk DSL for the rewrite engine.
Материалы по теме:，这一点在heLLoword翻译官方下载中也有详细论述
A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.，更多细节参见Line官方版本下载
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