Question: What is the "binary" property in a "package.json" file for?

One of the properties your module checks to determine if a given "package.json" file represents a native module is ["binary"](https://github.com/juliangruber/is-native-module/blob/62d7050a524012fdae7cadd5f3195be73f8d33e4/index.js#L11). However, I can find no record of such a property ever existing or being used by `npm` or `node-gyp`.

Can you please fill me in on what this property was for? Or any documentation on what consumes it? I asked a few of the NPM collaborators on package.community and even they did not recognize it offhand.