recommendation about 'strict mode'

Hi All,

The line:

newChildObject = myMC;

produces an error ("Access of undefined property newChildObject") when my I have 'strict mode' checked in my Advanced Actionscript 3.0 Settings window but not when I have that unchecked.

(I'm assuming that I'll need a 'var' in front of that variable to keep it from throwing an error in 'strict mode.' )

Should I keep my 'strict mode' checked? Will it help prevent some problems down the road (like in SWF versions)?

Thanks