I use it and it works great. The only thing I'm missing is support for <i>trim_blocks</i> and <i>lstrip_blocks</i>. Without this my templates are a dashes in curly braces <i>{%- -%}</i> hell.
Use the nunjucks js all the time! Really works so well and the performance is insane. Render 20 plus just in time in a React Lowdefy app and no lagging. Would love to see a performance benchmark for a wasm version of this!