lubridate::ms - surprising behavior when it comes to parsing seconds

tidyverse
1 
lubridate::ms("9.2", "9.20", "9.02")

[1] "9M 2S" "9M 20S" "9M 2S"

I am puzzled to see that 9.2 is treated the same as 9.02.
My expection would be that 9.2 is interpreted as 9M 20S.
How can i get 9.2 treated as 9 minutes and 20 seconds?
Many thanks.

2 
> lubridate::ms(sprintf("%.2f", as.numeric(c("9.2", "9.20", "9.02"))))
[1] "9M 20S" "9M 20S" "9M 2S"
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