function baseSampleSize(collection, n) {
      var array = values(collection);
      return shuffleSelf(array, baseClamp(n, 0, array.length));
    }
The base implementation of `_.sampleSize` without param guards.

@private
@param {Array|Object} collection The collection to sample.
@param {number} n The number of elements to sample.
@returns {Array} Returns the random elements.