> On Jan 13, 2017, at 9:46 AM, Sean McBride <s...@rogue-research.com> wrote:
> 
> Anyone ever seen nil passed to isEqual:?  Is the SDK declaration maybe wrong?

Check the class documentation, not just the header. The parameter is declared 
as:
        anObject        The object to be compared to the receiver. May be nil, 
in which case this method returns NO.

So yes, the parameter should be declared as `nullable`.

—Jens
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