Not working for primitives?

The doc says:

The Object can be a regular Object, an Array, a Function, a RegExp, or any of the primitive types or constructor function created with new.

The "or any of the primitive types" part suggests that plain string, number, boolean, etc. should also work, but this doesn't seem to be the case to me. Can you clarify?

cc @jiangzidong

I am similarly disappointed. Here's the error:

$ node -e "require('weak')('a string')"
/home/rpaterson/programming/signpost/essentials/node_modules/weak/lib/weak.js:49
  var weakref = bindings._create(obj, new Emitter());
                         ^

TypeError: Object expected
    at TypeError (native)
    at create (/home/rpaterson/programming/signpost/essentials/node_modules/weak/lib/weak.js:49:26)
    at [eval]:1:16
    at ContextifyScript.Script.runInThisContext (vm.js:25:33)
    at Object.exports.runInThisContext (vm.js:77:17)
    at Object.<anonymous> ([eval]-wrapper:6:22)
    at Module._compile (module.js:570:32)
    at Immediate.<anonymous> (bootstrap_node.js:357:29)
    at runCallback (timers.js:637:20)
    at tryOnImmediate (timers.js:610:5)

Javascript has built-in WeakMap and WeakSet now, but they only support Objects as well. I was hoping that I could build a weak Map/Set impl for Strings based on this module.

Here's the line that throws the error:

node-weak/src/weakref.cc

Line 174 in f222cf7

if (!info[0]->IsObject()) return Nan::ThrowTypeError("Object expected");

Looks like it dates back to the original creation of this repo.