What does the double asterisk mean in proguard rules?

Question

What does this rule mean in proguard for example:

-keep class myjava.** {*;}

I understand {*;} part would mean all members and methods in t

Answer 1

From the manual:

Types in classname, annotationtype, returntype, and argumenttype can contain
wildcards: '?' for a single character, '*' for any number of characters (but
not the package separator), '**' for any number of (any) characters, '%' for
any primitive type, '***' for any type, and '...' for any number of arguments.