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I backported symbol support from MobX 5 to MobX 4, without thinking it really through. Although symbols could potentially be used in practice, this probably misses the point that mobx 4 is used in more backward compatible modi, and didn't require polyfills as of yet.
This PR reverts symbol support. A downside of this PR is that this increases the semantical difference between mobx 4 and 5
Fixes #1986, #1987