Publish AbstractStreamEx class

[amaembo]

Currently some methods are defined in the AbstractStreamEx class which is package-private. This limits the possibilities to use method references with javac <8u102 (see JDK-8143647). Seems that ECJ also sometimes compiles such references incorrectly. Here's testcase which fails:

List<String> input = asList("a", "b", "c");
assertEquals(input, input.stream().map(StreamEx::of).reduce(StreamEx::append).get().toList());

When compiling with javac:

java.lang.IllegalAccessError: one/util/streamex/AbstractStreamEx

When compiling with ecj:

java.lang.NoSuchMethodError: one.util.streamex.StreamEx.append(Ljava/util/stream/Stream;)Lone/util/streamex/StreamEx;

Seems that it's possible to make AbstractStreamEx public which would also solve some javadoc-related issues and compilation errors in some corner cases (like reported in #81). If you have better idea for its name, you're welcome.

• Write AbstractStreamEx class JavaDoc
• Make it public
• Deduplicate chain method
• Provide at least some tests from another package which validate this change (see also Move API tests to the separate package #91)
• Changes

[lirikooda]

I'm seeing the something similar with code compiled with kotlin (1.7.10).
Calling a StreamEx .distinct() works fine, but .distinct(java.util.function.Function) fails with NoSuchMethodError.
Any idea?

[amaembo]

Please provide a link to a minimal project that illustrates the problem. Thanks. Likely a Kotlin compiler problem.