Fix deprecated datetime.utcfromtimestamp usage and stop union() mutating its arguments - #264
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ms_to_datetimeuseddatetime.utcfromtimestamp(), deprecated since Python 3.12 — replaced withdatetime.fromtimestamp(..., tz=timezone.utc)with an identical aware-UTC return value.union()also extended its first argument in place, silently growing a caller's (possibly shared) list — it now builds a new list with the same dedup/ordering semantics. Tests cover the round-trip and non-mutation.