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Daniel Boles authored
We named the argument `position` in the code and doc arguments, but the rest of the documentation referred to `index` instead. That was maybe meant to hint at the child property named :index, but we can simply be fully clear here. We can call the argument `index_`, replacing the local variable with that name, thus avoiding any possible confusion with the unrelated ::get-child-position, and refer users to :index for completion `index_` is used instead of plain `index` in case anyone is #including <strings.h> and getting the old index() function superseded by strchr(); see !932 (comment 531149)
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