indicate failure to export functions, rather than return null in top level #1
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the most meaningful change in this pull request is to indicate failure to export function. this replaces an attempt to return null at the top level, which is invalid.
other changes include making explanations fit within the comment stars, removing stray end-of-line whitespace, and my favorite, standardizing the indent space count. some files had 4, some had 2. i was not able to quickly separate this last change into its own commit, so it's mixed with the others.