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set_export_callback
Combined from primary sources listed below.

In Metamodel::EnumHOW§

See primary documentation in context for method set export callback. 

method set_export_callback($obj, $callback)

Sets the enum's export callback, which is invoked when calling .compose_values. This is called when applying the export trait to an enum. $callback should be a routine of some sort, taking no arguments, that handles exporting the enum's values.