is(xsys(@cfg, "$cfgpfx.filter", 'PublicInbox::Filter::RubyLang'), 0);
is(xsys(@cfg, "$cfgpfx.altid",
'serial:alerts:file=msgmap.sqlite3'), 0);
is(xsys(@cfg, "$cfgpfx.filter", 'PublicInbox::Filter::RubyLang'), 0);
is(xsys(@cfg, "$cfgpfx.altid",
'serial:alerts:file=msgmap.sqlite3'), 0);