## Important Notes

1. Always run `mvn test` after changes
2. Run `mvn formatter:format` before committing
3. Add license headers to new files with `mvn license:format`
4. Maintain backwards compatibility - deprecate before removing

---
title: "Go, Backwards Compatibility, and GODEBUG"
layout: article
---

<!--
This document is kept in the Go repo, not x/website,
because it documents the full list of known GODEBUG settings,
which are tied to a specific release.
-->

## Introduction {#intro}

Go's emphasis on backwards compatibility is one of its key strengths.
There are, however, times when we cannot maintain complete compatibility.

		last := n - 1
		i := last
		fails := 0
		for i < len(s) {
			if s[i] != b[last] {
				o := IndexByte(s[i+1:], b[last])
				if o < 0 {
					return -1
				}
				i += o + 1
			}
			// Step backwards comparing bytes.
			for j := 1; j < n; j++ {
				if s[i-j] != b[last-j] {
					goto next
				}
			}
			return i - last
		next:
			fails++
			i++

        `tf.errors.UnimplementedError` (with an understandable message) to be
        thrown.
        *   `tf.nn.sparse_softmax_cross_entropy_with_logits` forwards and/or
            backwards. See PR
            [47925](https://github.com/tensorflow/tensorflow/pull/47925).
        *   `tf.image.crop_and_resize` gradient w.r.t. either `image` or
            `boxes`. See PR

		[]byte("ab\xc0a\xc0")},
	{not(isValidRune), "\xc0a\xc0",
		[]byte("a"),
		[]byte("a\xc0"),
		[]byte("\xc0a")},
	// The nils returned by TrimLeftFunc are odd behavior, but we need
	// to preserve backwards compatibility.
	{isSpace, "",
		nil,
		nil,
		[]byte("")},
	{isSpace, " ",
		nil,
		nil,
		[]byte("")},
}

func TestTrimFunc(t *testing.T) {

- Updated the Partitionable Devices feature to support referencing counter sets across ResourceSlices within the same resource pool. Devices from incomplete pools were no longer considered for allocation. This change introduced backwards-incompatible updates to the alpha feature, requiring any ResourceSlices using it to be removed before upgrading or downgrading between v1.34 and v1.35. ([#134189](https://github.com/kubernetes/kubernetes/pull/134189), [@mortent](https://github.com/mortent))...

## 0.128.3 (2026-02-06)

### Refactors

* ♻️ Re-implement `on_event` in FastAPI for compatibility with the next Starlette, while keeping backwards compatibility. PR [#14851](https://github.com/fastapi/fastapi/pull/14851) by [@tiangolo](https://github.com/tiangolo).

### Upgrades

  }

  public void testFrom() {
    Function<String, Integer> forward = Integer::parseInt;
    Function<Object, String> backward = toStringFunction();

    Converter<String, Number> converter = Converter.<String, Number>from(forward, backward);

    assertThat(converter.convert(null)).isNull();
    assertThat(converter.reverse().convert(null)).isNull();

        .containsExactly(Country.CANADA, Country.SWITZERLAND, Country.CHILE)
        .inOrder();
    // backward map ordered by country
    assertThat(bimap.inverse().keySet())
        .containsExactly(Country.CANADA, Country.CHILE, Country.SWITZERLAND)
        .inOrder();
    // backward map ordered by country (even for currency values)
    assertThat(bimap.inverse().values())

	<component name="pingJob" class="org.codelibs.fess.job.PingSearchEngineJob" instance="prototype">
	</component>
	<component name="pythonJob" class="org.codelibs.fess.job.PythonJob" instance="prototype">
	</component>
	<!-- Backward Compatibility  -->
	<component name="pingEsJob" class="org.codelibs.fess.job.PingSearchEngineJob" instance="prototype">
	</component>