📣 For those who've tried Kotlin immutable collections and struggled with the operator importing we're going to suggest the following rather drastic solution: https://github.com/Kotlin/kotlinx.collections.immutable/issues/10#issuecomment-305277264
TLDR: We propose not to extend the immutable collections from read-only ones to mitigate this issue.
If you have any objections or notes, please share them in that issue comments.