Why doesn't Zig have std.HashSet?

We can use std.HashMap with the Key=<your set element type> and Value=void, but seems hacky: the API isn’t as good as it could be e.g. you have to treat keys as your values and disregard a big part of the API. This issue exists, but was closed without comment. Does anyone know why std does not / cannot have HashSet? Wondering if there’s a good reason I’m not seeing