Get the length of list stored in file.
## S3 method for class 'largeList'
A largeList object created by getList.
largelist_object <- getList("example.llo", truncate = TRUE)
largelist_object[] <- list("A" = 1, "B" = 2, "C" = 3) ## assign list to the list file
length(largelist_object) ## get 3
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