Find dangling and duplicated cross-references (Section 3.2, Table 4, Figure 2, [7]) in a document

Overview

Scans a document for the targets it defines (numbered headings, Table/Figure/Listing/Equation captions at line start, Appendix/Annex headings, [n] bibliography entries, [^id] footnote definitions) and the references it makes to them ('see Section 3.2', 'Tables 2 and 4', 'Figures 3 to 5', '[7]', '[^note]'), and reports references with no target, targets defined twice, and targets never referenced, each with offsets in UTF-16, code points, UTF-8 bytes and graphemes. English lab

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