Version

3.0.0-rc.9

Reproduction link

https://codepen.io/fuzzyma/pen/PoNKVoK

Steps to reproduce

Run the codepen with console open

What is expected?

Vue.set should be defined

What is actually happening?

Its not

According to the docs:

Important

The above only applies to the ES Modules builds for use with tree-shaking capable bundlers - the UMD build still includes all features and exposes everything on the Vue global variable (and the compiler will produce appropriate output to use APIs of the global instead of importing).

So it should be available, shouldnt it?