> I highly recommend treating warnings as errors. (There's a checkbox for that 
> in the build settings.) There are too many types of serious issues that the 
> compiler only treats as warnings — the most serious one is the Obj-C 
> 'unrecognized selector' warning. If I misspell a method name, that's a 
> guaranteed exception at runtime, so I want to fix it right away.

Indeed - a similar situation can arise where the compiler is forced to
guess the type of an argument to the said method, often leading to its
corruption at runtime. That's a fun one to debug.
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