Like a list, but has some methods. Completely superflous, but
makes copying some code algorithms easier. We implement methods
iteration. As well, there are some lookup methods.
TRUE if name is key in array
Iterator for lists, like sapply, but FUN gets passed index, key, and value
Reset array, return contents as list
get item under name
Return an id, or name, for an object
Get item by index
Like ext.pluck. Returns array with 'id' extracted from each item in the Array
Append x with optional name. If name not specified new id created. Returns name
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