versions <- c("9.10", "9.2")
nv <- numeric_version(versions)
class(nv)
## [1] "numeric_version"
max(nv) # ok
## [1] ‘9.10’
versions[tail(order(nv), 1)] # ok
## [1] "9.10"
sort(nv, decreasing = TRUE)[1] # ok
## [1] ‘9.10’
versions[which.max(xtfrm(nv))] # ok
## [1] "9.10"
versions[which.max(nv)] # error
## Error in which.max(nv) : 'list' object cannot be coerced to type 'double'
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