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It'd be pretty damn nice if tools.time.seconds_to_human() could output abbreviated units on demand. If I think about it for more than a few seconds, though, it seems more likely that we'll need a full-on format specification to accommodate different preferences—whether the abbreviations should contain ., whether to use e.g. sec or secs (or just s)…
Tangentially related to #1798, if only because we'll need support in this feature for both "fuzzy" and exact output modes.