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Invert a javascript object so that keys are values and values are keys
Invert an object so that keys becomes values and values become keys. Duplicate values in input is allowed by puttin all keys in arrays.
var assert = require('assert')
, invertObject = require('invert-object')
, inverted = invertObject({foo: '1', bar: 1})
assert.deepEqual(inverted, {1: ['foo', 'bar']})