TwinBasic

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You might be right. Who knows. All I know is something as powerful typedef needs to be used responsibly. People who come from unforgiving programming backgrounds like C++ tend to be very respectful of it's power. Perhaps it might be good for TwinBASIC, I don't know. I'm not really leaning hard one way or another. It's just that my first instinct is that it doesn't belong in BASIC. I could be wrong. I guess we'll see what happens.

I'm of two minds about TypeDefs:
Reading C-Code it drives me up the walls trying to figure out, what's the "original" type.
Not knowing any better, i think TypeDefs in C were invented because C-Programmers are lazy buggers :-)

OTOH, the example on the page linked to above, defining SubSets of Types is intriguing, so a MyWindow=MyMenu shouldn't compile despite being the same base-type