Apparently, the documentation solution (readthedocs.org) treat . as seperation characters index time, but not query time - search “content query” to get a match.
Sorry bout that - the doc’s are not running on XP you see
The search function here uses a different index, and works much better. Specifically, hyphenated words, like “lib-mail”, will not return any result inside each version of the documentation, but match several on this starting page!
PS: We have asked readthedocs to fix this, and they are working on it: https://github.com/rtfd/readthedocs.org/issues/1808