This issue was originally filed by @seaneagan

In LogEntry:

String methodName;
List arguments;

should be replaced with

Invocation invocation;

And the CallMatcher concept should be replaced with true Matchers against Invocations.

That way named arguments are supported, and less concepts and API surface are needed.

Then callsTo could support a Symbol as the member name, and could be implemented itself with noSuchMethod, allowing to use named arguments as well:

callsTo(#foo, new isInstanceOf<String>(), someNamedArg: isNotNull);

which would match calls like:

mock.foo('a String', someNamedArg: notNull);