I discovered this one as I was working on #498.

The problem is we catch absolutely all parameter mismatches, including "legitimate" ones which happen long after we've made the call to MAIN.

I was expecting this code to work:

my $ua = HTTP::UserAgent.new(timeout => 10);
say $ua # HTTP::UserAgent.new(timeout => 180, …)

But it doesn't, and it seems like I have to set the timeout with $ua.timeout = 10. Would've been great if it was possible to set the timeout right from the constructor.