reduced memory requirements of ll_child & ll_descendant: in both cases, we do not need the ctx on the stack.
reduced memory requirements of ll_child & ll_descendant:
in both cases, we do not need the ctx on the stack.

ll_child:      -20% (5*4(8) byte -> 4*4(8) byte)
ll_descendant: -33% (3*4(4) byte -> 2*4(8) byte)

... I cannot tell, whether / how much this improves the performance ...

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