gistfile1.js

function shrinkwrap(gen) {
  return {
    arbitrary: gen.arbitrary,
    shrink: function(value) {
      var shrinks = [];
      for (var i = 0; i < maxShrinks; i++) {
        try {
          shrinks[i] = gen.randomShrink(value);
        } catch (err) {
          if (err.constructor !== Unshrinkable) throw err;
        }
      }
      return shrinks;
    },
    show: gen.show,
  };
}