Feature/better object keys

[asosnovsky]

I got tired of always adding these two simple rules to my projects. I really think this should have been in the spec in the first place. Hopefully this tiny change will make sense :)

• Code is up-to-date with the master branch
• You've successfully run gulp runtests locally

[ghost]

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[DanielRosenwasser]

This is a duplicate and has been rejected multiple times: #12253 (comment), #30314, #13254. #30228, #28899, #28284, #26901, #30749, #31087, #32321, #34498, #35145, #37495, #38328, #38883. (thanks @MartinJohns for
#37495 (comment)!)

[MartinJohns]

I actually stopped referencing all duplicate issues because @RyanCavanaugh made me worry. :-D

[DanielRosenwasser]

I do something similar actually #27390 (comment)

[RyanCavanaugh]

https://stackoverflow.com/questions/55012174/why-doesnt-object-keys-return-a-keyof-type-in-typescript