For too long has the Hexen (and later, UDMF) format been king of the instadeath floor. Boom should have implemented this decades ago, but it never happened. Now it's time for source port authors everywhere to remedy this by collectively adding an instadeath floor sector special compatible with the Doom map format. Join the compact.   This could possibly be accomplished by:   1) Adding it to a new sector special type range that the Doom (and Heretic/Strife) specials never come