MewBot is introducing errors
I think the other possibility is not to have Module:parameters strip whitespace, but to do it in Module:usex/templates so it applies only to {{ux}}
. This business about leading/trailing whitespace being stripped in named but not unnamed params is a total kludge but it's the way Mediawiki works, and things like mwparserfromhell seem to know about this, so it may not be a good idea to change it.
I think stripping whitespace should be the default behaviour. For Italian specifically, an override could be added to Module:parameters. However, I think it would be better to look at why the template needs to work this way to begin with.
BTW, I just looked at Wikipedia's Arguments module and it works this way -- whitespace is trimmed by default from parameters, but you can turn it off. The documentation appears to say that setting trim=false turns off whitespace trimming, and setting removeBlanks=false turns off the conversion of empty arguments to missing arguments (i.e. the implementation of ine() around arguments).