proposal: Modify the tables proposal to allow tables of any dimension.
proposal: Modify the tables proposal to allow tables of any dimension.

Change-Id: Ia4af1b21f6e60ac1ffcaacdf441cc254ad58a8e4
Reviewed-on: https://go-review.googlesource.com/17133
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

golang/proposal,golang/proposal