Add a idna that checks whether non-character letters like _ and * are preserved when IDN is enabled. This wasn't the case when UseSTD3ASCIIRules were enabled, f.e. _ from _tcp would get mangled to tcp.
Add a idna that checks whether non-character letters like _ and * are preserved when IDN is enabled. This wasn't the case when UseSTD3ASCIIRules were enabled, f.e. _ from _tcp would get mangled to tcp.