Commit messages/comments should not convert subscripts to footnote references
Commit messages, like "
Fixed problem with accessing a", that contain subscript indices are converted by RedCloth into footnote references. See, for example, the commit message on r9278 and the "Associated Revisions" section of #10505. Footnotes don't make sense on commit messages.
My workaround, for the time being, is to format subscripts as "a[ 0 ]", with extra space around the index.