Memory leak in fragments

[Inviz]

Hello.

createElement(Fragment) permanently puts an entry into vnodesForComponent, which then never gets cleaned up. Further diffing becomes slower, as a hook will try to iterate all entries. The app gets slow.

[Inviz]

@JoviDeCroock mentioned:

Skipping built-in's here would fix that https://github.com/preactjs/prefresh/blob/main/packages/core/src/runtime/vnode.js#L15

I think it's reasonable way to approach it.