States whether the WhenType concerns the beginning of a binding execution (at start). Not that 'then' is included since 'then' is called at start. This includes both strict and non strict mode.
The WhenType to test
True: when executed at start
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States whether the WhenType concerns the beginning of a binding execution (at start). Not that 'then' is included since 'then' is called at start. This includes both strict and non strict mode.