@CompileStatic: A method which has default value parameter and generic return type will cause type checking error

import groovy.transform.CompileStatic
import org.junit.Test

class Bug1Base<T> {
	T t

	T get(a, b=0) {
		return t
	}
}

class Bug1 {
	@Test
	@CompileStatic
	void test() {
		Bug1Base<Integer> bug = new Bug1Base<Integer>(t:1)
		Integer t = bug.get(1)
		println t
	}
}

Groovyc: [Static type checking] - Cannot assign value of type T to variable of type java.lang.Integer