Represents a unit of time, e.g. used by Time.Span.to_string_hum. Comparison
respects Nanosecond < Microsecond < Millisecond < Second < Minute < Hour < Day.
include sig ... endval hash_fold_t : Ppx_hash_lib.Std.Hash.state ‑> t ‑> Ppx_hash_lib.Std.Hash.stateval hash : t ‑> Ppx_hash_lib.Std.Hash.hash_valueval compare : t ‑> t ‑> Core_kernel__.Import.intval t_of_sexp : Sexplib.Sexp.t ‑> tval sexp_of_t : t ‑> Sexplib.Sexp.t