Why React is not a peerDependency?

[viniciusbo]

Hi! I ran into some weird errors since the inclusion of rc-slider in one of my libs due to duplicated copies of React being loaded.

Since my use case needs React lib as an external dependency in webpack config, I was wondering why React is not loaded as a peerDependency in rc-slider's package.json instead? Actually the same is true for rc-tooltip lib. Thanks.