max = (out, a, b) => {
  out[0] = Math.max(a[0], b[0])
  out[1] = Math.max(a[1], b[1])
  return out
}
Returns the maximum coordinates of two vectors.

@param {vec2} out - receiving vector
@param {vec2} a - first operand
@param {vec2} b - second operand
@returns {vec2} out
@alias module:modeling/maths/vec2.max