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TwitterisSaving
Returns if the instance is currently being saved.
instance.isSaving()
Observes if a promise returned by connection.save is in progress for this
instance. This is often used in a template like:
<button on:click="todo.save()"
disabled:from="todo.isSaving()">
Save Changes
</button>
Returns
{Boolean}:
Returns true if connection.save has been called for this
instance but the returned promise has not yet resolved.