if (Boolean)
Everything inside an if statement is automatically coerced into a Boolean.
Either it is or it isn't.
It's not more clear to write != null because an if statement cannot possibly be
anything other than true or false. In this case, null or not null. Writing it
out is redundant (and more code).
Recommended reading:
http://opensource.adobe.com/wiki/display/flexsdk/Coding+Conventions
Specific to this case:
http://opensource.adobe.com/wiki/display/flexsdk/Coding+Conventions#CodingConventions-Expressions
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