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kotlinlang

Hey, we would like upgrade Spring Framemwork 5.0.3 (and Spring Boot 2) to Kotlin 1.2, but we need to ensure binaries will stay compatible with Kotlin 1.1 projects. I have read carefully <http://kotlinlang.org/docs/reference/compatibility.html#binary-compatibility-warnings> but it is not 100% clear. So my question is: is it safe for use to switch Spring Framework on 1.2.0 with `apiVersion = 1.1` and `languageVersion = 1.1` options activated on production code like in this commit <https://github.com/sdeleuze/spring-framework/commit/5f410f76d26605a1cb185c503e7b80fb8d7cf42c> ?