typo in example text: unsused -> unused; noticed by tb@

If a node is tagged explicitly, skip implicit tagging for that node.
Apart from making sense in the first place, this fixes an assertion
failure that happened when the calculated implicit tag did not

If a node is tagged explicitly, skip implicit tagging for that node.
Apart from making sense in the first place, this fixes an assertion
failure that happened when the calculated implicit tag did not match
the string value of the first child of the node,

Bug found by tb@ using afl(1).

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