I'd PREFER getting a LIST of all the tags that start with "t" when I type "t" in a tag search, rather than what happens now, which is I get a list of every tag that contains a letter "t". I find that annoying, and I'm quite sure it used to work as I describe, and I would like it to work that way again. For example if I want to add the existing tag "T'ai Chi", when I type "T", I see "Atomic, Charity, and Comcast" along with every other tag that contains a "t".
Fortunately if I type more characters of the tag... T+apostrophe that is—"T'"—I then get the "T'ai Chi" tag. (I believe this was only recently fixed, and it does help.)
I could never see a case for locating a partial in a tag. Such as the example by Wilf Sorrow, above. Wilf wants the exact opposite.
Maybe there could be some option in Preferences to toggle or otherwise manage this capability, so we could both get what we want!!