yarn skip to add this dues to non-deterministic behavior

[zymr-keshav]

• macOS 10.12.6
• node -v 6.11.4 ( installed thrugh nvm)
• gulp -v 3.9.1
• yarn -v 1.2.1

when try to add yarn add gulp-util -D it gives warning in terminal

warning Pattern ["gulp-util@^3.0.8"] is trying to unpack in the same destination "/Users/keshav.m/Library/Caches/Yarn/v1/npm-gulp-util-3.0.8-0054e1e744502e27c04c187c3ecc505dd54bbb4f" as pattern ["gulp-util@^3.0.0","gulp-util@^3.0.7","gulp-util@^3.0.6","gulp-util@3.0.8","gulp-util@^3.0.8"]. This could result in a non deterministic behavior, skipping.

why is this happening? even gulp util is working fine but this thing bothers me

[yocontra]

Sounds like a yarn bug, you should open a ticket there.