title: Initializing with an expression of incompatible type even though it returns the right type
body: <p>CGFloat color = [[myArray objectAtIndex:0]valueForKey:@"redComponent"];
  I know this array will return a float but xcode is saying: 
  <code>Initializing 'CGFloat' (aka 'float') with an expression of incompatible type 'id _Nullable'</code>. I have NSLog'd the result even to check it. How do i get over this?</p>