Huh. I did the same experiment — copied Calculator from my Sierra Mini to my 
Mojave Mini and ran the sequence. As you did, I got Not a number, same as the 
native Calculator.

Then I did it again, copying it to my High Sierra MBP.

I got "8".   😱

No fooling. I've done it a half dozen times using different sequences of 
keystrokes (voodoo, to be sure, but one should make the trial).

Something is clearly rancid here.

All the responses I got back from AMUG were consistent: "Not a Number" on HS or 
M, the correct number everywhere else.



> On Jan 9, 2020, at 1:02 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:
> 
> Wow, that would seem to indicate that a macOS system RTL or framework has a 
> huge bug! 
> 
> -Carl
> 
> 
>> On Jan 9, 2020, at 12:53 PM, Andy Ringsmuth <a...@andyring.com> wrote:
>> 
>> Just tried that. Still “not a number” answer.
>> 
>> 
>> -Andy
>> 
>> 
>>> On Jan 9, 2020, at 12:36 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> 
>>> wrote:
>>> 
>>> An interesting test would be to take the Calculator.app from Sierra and run 
>>> it on Mojave.
>>> 
>>> -Carl
>>> 
>>> 
>>>> On Jan 9, 2020, at 12:32 AM, Jean-Christophe Helary 
>>>> <jean.christophe.hel...@traduction-libre.org> wrote:
>>>> 
>>>>> On Jan 9, 2020, at 11:59, Dinse, Gregg (NIH/NIEHS) [C] 
>>>>> <di...@niehs.nih.gov> wrote:
>>>>> 
>>>>> A friend just told me that it works on his Catalina mac, so perhaps they 
>>>>> fixed it in the latest OS.  I do not have any Catalina machines, so I 
>>>>> can't check that.
>>>> 
>>>> Catalina here and both input work.
>>>> 
>>>> Jean-Christophe Helary
>>>> -----------------------------------------------
>>>> http://mac4translators.blogspot.com @brandelune
> 
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