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Part // interesting undocumented feature

A colleague new to Mathematica showed me something that I thought should cause an error:


Of course, I thought the form should just be "data[[All,1]".

It turns out that there is form of Part that works like an identity function:

In[1]:= Part[5]
Out[1]= 5

Just out of a Mathematica trivia challenge question, can anyone think of an example when this undocumented syntax of Part[ ] could possibly be of use or why the programmers have it as an acceptable syntax?

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