16-ea is not 'atLeast("16")'

[bmarwell]

JDK identifying as 16-ea does not satisfy .isAtLeast("16").

This makes it impossible to test some maven plugins early using ea-versions.

[rfscholte]

This is similar to the -SNAPSHOT discussion. According to

plexus-languages/plexus-java/src/test/java/org/codehaus/plexus/languages/java/version/JavaVersionTest.java

Lines 66 to 69 in 6c09c07

	@Test
	public void testJEP223Short() {
	// http://openjdk.java.net/jeps/223
	assertTrue( JavaVersion.parse( "9-ea" ).compareTo( JavaVersion.parse( "9" ) ) < 0 );

9-ea is before 9.
Most likely you're not testing the java version, but the implementation version, in which case you should use https://codehaus-plexus.github.io/plexus-languages/plexus-java/apidocs/org/codehaus/plexus/languages/java/version/JavaVersion.html#JAVA_SPECIFICATION_VERSION