R devel - Dec 2025 - Setting of "balanced" attribute by 'length<-.POSIXlt'

In R 4.5.2 (not before), `length<-.POSIXlt` sets "balanced"
attribute of the result to TRUE only ifisTRUE(attr(x, "balanced"))
&& value <= length(x) .

For 'value' that is not a whole number, it is possible that value >
length(x) and the length of the result is still length(x).
Instead ofvalue <= length(x) ,it is better to usevalue < length(x) + 1(not
length(x) + 1L as length(x) may be .Machine$integer.max)orvalue - length(x) <
1Lortrunc(value) <= length(x)orlength(r) <= length(x)orlength(r$year)
<= length(x)(or other component of 'r').
By the way, `length<-.POSIXlt` should also use unCfillPOSIXlt(x) instead of
unclass(x). For example, when the maximum component length is 3 and a component
has length 1 and 'value' (the assigned length) is 2.
If unCfillPOSIXlt(x) is used and is assigned to 'x', length of any
component can be used.
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