ColdFusion Scope Precedence

A while back (August 2015), Himansu Sekhar Khuntia logged a bug for ColdFusion 10 that dealt with the scope precedence of LOCAL and ARGUMENTS scopes within a function, and specifically how unscoped variables were effected with CF's scope hunting. Current behavior of ColdFusion 10 has ARGUMENTS taking precedence over LOCAL, and I really don't know how far back this problem goes, but apparently the behavior should be LOCAL over ARGUMENTS.

Original bug report for CF10: https://bugbase.adobe.com/index.cfm?event=bug&id=4031746
Possibly related for CF2016: https://bugbase.adobe.com/index.cfm?event=bug&id=4119653

Inside a function, LOCAL scope SHOULD take precedence over ARGUMENTS scope. This is fixed in 2016 (need to try it out) and planned to be fixed in 10/11. We'll see which patch it makes it into.

To make things interesting, I decided to play with the function scopes in CF10 (pre-scope order fix), and got some interesting results. See below.

Moral of the Story: ALWAYS SCOPE YOUR VARIABLES!!!!! To be extra safe, it probably wouldn't be a bad idea to try to keep from naming a variable the same in multiple scopes. ARGUMENTS and LOCAL are SUPPOSED to be mutually exclusive, but they aren't always.

Anyway, thank you to Adobe for actually clarifying that. Now I need to start reporting the discrepancy when I see it documented incorrectly, ie http://www.learncfinaweek.com/week1/Scopes/.

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