Post #1822815

@ekuber @bitprophet @dalias @cliffle you may also be interested in the official "roadmaps" of each plane, which is driving at a similar idea but includes more detail: https://www.unicode.org/roadmaps/ In particular, those maps also nominally communicate some information about the UTC's intended plans for the future. These maps were how I found out that there is a plan to add Seal Script to the Tertiary Ideographic Plane. At one point there were ranges were allocated for Oracle Bone Script but it changed to Seal Script at some point https://www.unicode.org/roadmaps/tip/