gvm installs wrong go on (at least) OSX

[ryanobjc]

$ gvm install 1.2
Installing go1.1.2...

• Compiling...

I'm not sure how go1.1.2 == 1.2 but ok....

I then installed go1.2 and that worked:
$ gvm install go1.2
Installing go1.2...

• Compiling...

then I get:
$ gvm use 1.2
Now using version go1.1.2
$ go version
go version devel +1b5a82d4b552 Sun Apr 20 20:29:17 2014 +0200 darwin/amd64
$ gvm use go1.2
Now using version go1.2
$ go version
go version devel +1b5a82d4b552 Sun Apr 20 20:29:17 2014 +0200 darwin/amd64

So I think I must be missing something, because (a) neither of these versions have a tagged release version number and (b) they are both the same! go1.1.2 == go1.2 ????