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Vocabulary
It is a word used a lot throughout the documentation, thus it deserves some clarification. An identity is any sort of data, could be a collection, a string, a number, anything. In other words, an identity is data with unknown datatype or value. An identity is not a key name.
null , undefined , false ,
0 , 1 , 2 , 3 ,
'four' ,
[5,'six'] ,
{seven:'7'}, { A: ['Hello','World'] } .. and the list goes on, are all perfect examples of identities..
seven, however, referring to the key 'seven' in { seven: '7' } is not an identity.
We make distinction of this, not due to a philosophy of some sort, but rather a more technical reason.
It is a word to describe an identity that is iterable, in other words, that contains keys, whether it be an array with items or an object with properties. A collection is also usually referred to as the data that gets inspected by a mitsuketa function.