get [object Object] in sandbox

[FanShiDe]

I'm running code in sandbox provided by vm2

const classnames = require('classnames')

function test() {
  var a = { name: true };
  const result = classnames(a)

  console.log('result', result)
}

test();

Because of vm2 provide proteced object, so the code arg.toString === Object.prototype.toString will get false

classnames/index.js

Line 32 in f2379c3

if (arg.toString === Object.prototype.toString) {

I think that should to be changed to arg.hasOwnProperty('toString') && typeof arg.toString === 'function', so that compatible with various running environments

[LassazVegaz]

I am working on this

[dcousens]

Fixed in #281