| Basic looping class; loops over a number of items (provided by its source parameter), rendering
its body for each one. It turns out that gettting the component to not store its state
in the Form is very tricky and, in fact, a series of commands for starting and ending heartbeats,
and advancing through the iterator, are still stored. For a non-volatile Loop inside the form,
the Loop stores a series of commands that start and end heartbeats and store state (either as
full objects when there is not encoder, or as client-side objects when there is an encoder).
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