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Without lifetime tracking, ranges pose a number of issues with regards to memory safety - use openArray instead which is limited but safe. In its present form, ranges take a copy of whatever is passed to them which obscures the copies that they take, leading to misleading and slow code. If openArray is not applicable, simply do a seq copy - it's fine and really doesn't matter in 95% of all cases, then profile and use other techniques where needed.
Candidates for standard library inclusion - functions and helpers that are too small to put in their own git repository