Ah, that makes sense. But that's, afaics, a completely undocumented operator which breaks standard (subject last) ML convention - I get why it's very useful for

Ah, that makes sense. But that's, afaics, a completely undocumented operator which breaks standard (subject last) ML convention - I get why it's very useful for interoperability with JS but jeez that isn't great work on the documentation front; I've been using Reason for small personal projects and libraries for the last six months and didn't even know that was a thing that had been defined