This is fascinating:
http://blog.4d.com/new-type-of-variable-collections/
1. "Arrays" of random data types.
2. Elements are accessed with [] not {}. E.g MyCollection[8]
3. The first element starts at zero.
4. They have an associated method - length. MyCollection.length
5. Appending past the length of the collection results in padding. That
is if your collection is currently 5 items long, adding something at
position 10 MyCollection[10]:="something" will add intermediate null items.
http://doc.4d.com/4Dv16R4/4D/16-R4/C-COLLECTION.301-3342374.en.html
http://doc.4d.com/4Dv16R4/4D/16-R4/New-collection.301-3342875.en.html
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