Subcommand overriding inherited mixed-in standard help options: IllegalArgumentException

[deining]

Minimum working example:

import picocli.CommandLine;
import picocli.CommandLine.ScopeType;
import picocli.CommandLine.*;

@Command(scope = ScopeType.INHERIT)
public class InheritHelpApp  {

    @Command(mixinStandardHelpOptions = true)
    void sub(@Option(names = "-foo") int foo) {
        System.out.printf("Foo: %d", foo);
    }

    public static void main (String... args) {
        new CommandLine(new InheritHelpApp()).execute("sub", "-foo", "42" );
    }
}

When running this code, I'm getting

java.lang.IllegalArgumentException: argument type mismatch
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at picocli.CommandLine.executeUserObject(CommandLine.java:1972)
	at picocli.CommandLine.access$1300(CommandLine.java:145)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
	at picocli.CommandLine.execute(CommandLine.java:2078)
	at InheritHelpApp.main(InheritHelpApp.java:14)

It's the combination of inherited scope + mixinStandardHelpOptions = true on the method subcommand that's causing trouble here. If I set scope to ScopeType.LOCAL, the sample runs fine.

[remkop]

Thank you for raising this and the example. I can reproduce this.
Investigating...

[remkop]

Great catch!

There was a logic bug that ended up removing the mixed-in standard help options from the subcommand, because it inherited from the parent and the parent did not have the mixed-in standard help options...

Thank you very much for raising this!