Keyed-record fused-rolling mapping. Each entry declares a window
(the key) and what to reduce over that window (the value).
Constraint: time-based windows only. Object keys are duration
strings or the 'buffer' sentinel. Count-based windows
(live.rolling(100, ...)) stay on the existing single-window
overload and are not mixable with time-windows in the fused form.
Keyed-record fused-rolling mapping. Each entry declares a window (the key) and what to reduce over that window (the value).
Constraint: time-based windows only. Object keys are duration strings or the
'buffer'sentinel. Count-based windows (live.rolling(100, ...)) stay on the existing single-window overload and are not mixable with time-windows in the fused form.