Library(csv) will convert space then integer into an atom and not an integer for default options

Nice to know
1

For the following data for a CSV file

 1,'Tom'
10,'Mary'

Since there is a space before 1 and most CSV definitions note that any space is considered data and should not be striped, space then 1 will be converted to an atom and not an integer, i.e. ' 1'

However 10 does not have a space and will be converted to an integer.

Note: library(CSV) has option

strip(+Boolean)
If true (default false), strip leading and trailing blank space. RFC4180 says that blank space is part of the data.