detachChild
removes a given child from the node's list. This child will no longe be maintained.
@param child the child to remove.
@return the index the child was at. -1 if the child was not in the list.
detachChild
removes a given child from the node's list. This child will no longer be maintained.
@param child the child to remove.
@return the index the child was at. -1 if the child was not in the list.
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