@ilya.gorbunov: I thought KEEPs were for language proposals only, since the README.md mentions that vague ideas should be discussed in #C0B9K7EP2 first. So, it's for small utility functions in the stdlib as well? If so, do I need to submit a KEEP and if so, is there a template? I've already given use cases in my PR and explained performance, while using the method is straightforward and should be clear from its documentation and tests.