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The policy on overlong combinations was set by R3, where there isn't 
as much need to flag them. Overlong combinations are a problem in 
UTF-8 for code that works on the binary encoding directly, instead 
of translating to Unicode first. The only function in R3 that operates 
that way is TRANSCODE, so as long as it doesn't choke on overlong 
combinations there is no problem with them being allowed. It might 
be good to add a /strict option to INVALID-UTF? though to make it 
check for them.

That's cool, Brian! :)

A note about KWATZ!, you suggest it to be text!, but it's not quite. 
It sure can be e.g. UTF-8 data:


(Setting my Terminal program to character encoding Unicode (UTF-8) 
and trying to load 3 ASCII letters, 3 danish letters and 3 greek 
letters)

w> load "abc ?????? ??????"
== [abc #{C3A6C3B8C3A5} #{CEB1CEB2CEB3}]


(Notice World isn't prepared to unicode yet, but can load it, as 
it can just be seen as bytes.)


But beside text, KWATZ! can also handle all other data, like escape 
codes or any binary format maybe combined with more understandable 
data, you wanna load.