I'm pretty sure that several search quality people are reading this thread now, but I'll try to mention this explicitly to people. Thanks for the suggestion.

Normally Google doesn't allows searches for punctuation, because doing so would swell the index size a lot for very little return in terms of helpful searches. But since we're engineers, we do search some punctuation, e.g. underscores so you can search for sprintf_s, and terms like C# and F#. I'll ask whether the # can carry through into Suggest.