static Map read(Map defProps, Key key, List files)
{
if (files.isEmpty()) return defProps;
Map acc = defProps.dup();
for (int i=files.sz()-1; i>=0; --i)
{
InStream input = ((File)files.get(i)).@in();
try { acc.setAll(input.readProps()); }
finally { input.close(); }
}
return (Map)acc.toImmutable();
}
