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Make Yarn the default, drop default vendor/asset directories #27300
FWIW we had some issues with yarn at Shopify where they shipped a few fully broken releases and pulled production versions in the last couple weeks. We had to pin the version at 0.16 and are carefully testing the newest one to make sure it doesn't break on us before rolling it out to all developers. 0.17 perhaps was just an anomaly, but it might make sense to wait a month or two to let it stabilize a bit before endorsing it for the whole Rails community.
Waiting two more months will double the time it's been in the wild and it doesn't seem like there is much urgency.