Writing my first, and so far only script, and I encountered a "parse error" which I think is due to the fact that constants in Ubasic can be 6 digits at most. Maybe "everybody" just knows this, because I had trouble finding a definitive statement.
In this page, http://chdk.wikia.com/wiki/UBASIC/uBASIC_syntax
it says variables are 32 bit unsigned integers, but says nothing about some additional restriction.
I also turned this up: http://images2.wikia.nocookie.net/__cb20100806022158/chdk/images/e/e5/UBASIC_User_Guide_D0_5.pdf
where it expands on the "32 bit signed integer" with:
"However, due to a bug in the current main release, values greater than 6 decimal digits cannot be assigned (i.e. 999,999 is the current maximum decimal value) – DF."
I'm not sure that is strictly correct, as it seems you can "assign" greater values provided you are in the know and a bit devious. If you wanted say x=9999999 (seven digits), x=2151*4649 should work.
Also, is this limitation really a bug? Has somebody actually tried increasing MAX_NUMLEN and found that something really bad happens?