Ban all inference of arrays with non primitive members in slow types

[lucacasonato]

https://www.typescriptlang.org/play/?#code/KYDwDg9gTgLgBAYwgOwM7xHAvHA3gKDiLgBsBLdALjgG1DiHc4BDagIgDMII2AaOAEbUaMKAFdgAXTgBfXvQZEmrOJ259BwgIz9RE6XIWLl1LQCYAzPwTU9wIjKOT5MgNxA

[dsherret]

Isn't this ok to leave for the ts emit, but not ok for dts?