var proto
  , map

module.exports = proto = {}

map = typeof WeakMap === 'undefined' ? null : new WeakMap

proto.get = !map ? no_weakmap_get : get

function no_weakmap_get(target) {
  return new DataView(target.buffer, 0)
}

function get(target) {
  var out = map.get(target.buffer)
  if(!out) {
    map.set(target.buffer, out = new DataView(target.buffer, 0))
  }
  return out
}