For example, suppose you define three scalar variables, named alpha, beta and gamma, and suppose that when you set them you first declare an unknown variable named delta. E.g.: you have this configuration file:

delta = D
alpha = A
beta  = B
gamma = G

Depending on the value of CREATE and PEDANTIC, you'll have different results, namely:

But if you run your script setting stuff in the same way, e.g.:

script.pl -delta D -alpha A -beta B -gamma G

results are completely different, namely:

The only values that correspond in the two cases are those marked in yellow. Is this the intended behaviour? I don't know, I hope I'll have an authoritative response from the module authors.