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update:
revamped: you can now call SelfInvoker() with an argument list, the calling syntax is unified with external filters. However unlike external filters, SelfInvoker does not have any error handling capacity. It is the filter developer's responsibility to ensure that only valid arguments are passed to SelfInvoker since it represents the "self" filter and it's private to the developer. The behavior is undefined (you will most likely encounter a segfault) if you call SelfInvoker with invalid arguments. all above examples have been updated to reflect the new calling syntax.
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