Do not implicitely convert a configuration value to text if the value is the result of just a variable expansion. This is technically a breaking change. But no known client code uses the old behaviour.

[config]
tmpdir = {{_tmpdir}}\2

[config.db.user]
name = the_database_user_2
__doc2 = Overwriting a comment
pwd=the-database-password-2

[config.db.locinfo.ro]
hostname = 3rd-host