Was Joseph Smith Smarter Than the Average Fourth Year Hebrew Student?

The brass plates version of Isaiah 2:2, as contained in 2 Nephi 12:2, contains a small difference, not attested in any other pre-1830 Isaiah witness, that not only helps clarify the meaning but also ties the verse to events of the Restoration. The change does so by introducing a Hebraism that would have been impossible for Joseph Smith, the Prophet, to have produced on his own.