Converting the argument to Paragraph.wordBoundary to dynamic temporarily until the framework code is converted to send a TextPosition instead of an int. I'll submit this, then update the framework side to send a TextPosition, and expect a TextRange or a List<int>, and then submit that, then I'll change this code to send a TextRange and take a TextPostion only, removing the dynamic here. Once that's done, I'll remove the code in the framework that expects a TextRange or a List<int>, and have it just expect a TextRange. This is so that we can change the API without breaking the builds. Landing on red to kick the engine builds.
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