Apparently this yields a non-trivial size decrease (gzip):
| File | Before | After | Diff |
|---|---|---|---|
| bootstrap.bundle.min.js | 22.38 kB | 22.3 kB | -0.08 kB (-0.36 %) |
| bootstrap.min.js | 15.86 kB | 15.83 kB | -0.03 kB (-0.19 %) |
I haven't tried passes > 2 yet, might be worth trying 3 or 5 too. I tried passes=5 and it results in the same savings as 3. Also, if we conclude this is fine, we might as well backport this to v4-dev.
Preview: https://deploy-preview-30411--twbs-bootstrap.netlify.com/