Type Alias SigFn

One function record [nameIdx, sigIdx, cgIdx, propBits, fileIdx, line] (sigIdx/cgIdx/fileIdx are -1 when absent), with an optional trailing topicIdx (the Rd help topic, -1 when it equals the name) and, after it, an optional reexportIdx (the package a re-export comes from). The trailing elements are additive: readers that stop at line ignore them, so older bundles stay readable.