This is fixed by node-vinyl-fs 3.0.3-3 from experimental as that version is compatible with glob-stream 6.x: https://github.com/gulpjs/vinyl-fs/blob/7e223749ee2ada1abd3b2fb326178d8ad8f39f2c/package.json#L30
I tried building yarnpkg with node-micromatch, gulp and node-glob-stream from experimental. The build succeeds provided I disable the patch 07-gulp.diff (that was required to make it work with gulp 3.9) yarn by itself is using gulp 4 since Aug 2018: https://github.com/yarnpkg/yarn/pull/6143 So from my POV you can go ahead with uploading to unstable all of them. P.
