The numerical summary methods always return integer64.
Therefor the methods for min,max and range do not return +Inf,-Inf
on empty arguments, but +9223372036854775807, -9223372036854775807 (in this sequence).
The same is true if only NAs are submitted with argument na.rm=TRUE.
lim.integer64 returns these limits in proper order -9223372036854775807, +9223372036854775807 and without a warning.