code: function clone(a) {
    var out = new Float32Array(9)
    out[0] = a[0]
    out[1] = a[1]
    out[2] = a[2]
    out[3] = a[3]
    out[4] = a[4]
    out[5] = a[5]
    out[6] = a[6]
    out[7] = a[7]
    out[8] = a[8]
    return out
  }
docs: Creates a new mat3 initialized with values from an existing matrix
  
  @alias mat3.clone
  @param {mat3} a matrix to clone
  @returns {mat3} a new 3x3 matrix