if !ok {
				continue
			}
			for _, spec := range d.Specs {
				if s, ok := spec.(*ast.ImportSpec); ok && s.Path.Value == `"C"` {
					// Replace "C" with _ "unsafe", to keep program valid.
					// (Deleting import statement or clause is not safe if it is followed
					// in the source by an explicit semicolon.)
					f.Edit.Replace(f.offset(s.Path.Pos()), f.offset(s.Path.End()), `_ "unsafe"`)
				}
			}

      } catch (_: FileNotFoundException) {
        // A file must have been deleted manually!
        for (source in sources) {
          source.closeQuietly()
        }
        // Since the entry is no longer valid, remove it so the metadata is accurate (i.e. the cache
        // size.)
        try {
          removeEntry(this)
        } catch (_: IOException) {
        }
        return null
      }
    }

b.form?a(b.form):b.form;a.formUtils.$win.trigger("validatorsLoaded",[c,b])})}}(a),function(a,b){"use strict";var c=a(b);a.formUtils=a.extend(a.formUtils||{},{$win:c,defaultConfig:function(){return{ignore:[],errorElementClass:"error",successElementClass:"valid",borderColorOnError:"#b94a48",errorMessageClass:"form-error",validationRuleAttribute:"data-validation",validationErrorMsgAttribute:"data-validation-error-msg",errorMessagePosition:"inline",errorMessageTemplate:{container:'<div class="{errorMessageClass}...

			n:            27,
			want:         26,
			wantErr:      io.EOF,
			wantBuffered: 0,
		},
		// Any error from filling shouldn't show up until we
		// get past the valid bytes. Here we return 5 valid bytes at the same time
		// as an error, but test that we don't see the error from Discard.
		{
			name: "fill error, discard less",
			r: newScriptedReader(func(p []byte) (n int, err error) {

```

O parâmetro `name` **ainda é obrigatório** (não *opicional*) porque ele não possui um valor padrão. Mesmo assim, `name` aceita `None` como valor:

```Python
say_hi(name=None)  # This works, None is valid 🎉
```

A boa notícia é, quando você estiver no Python 3.10 você não precisará se preocupar mais com isso, pois você poderá simplesmente utilizar o `|` para definir uniões de tipos:

 * the response, the client will issue a conditional `GET`. The server will then send either
 * the updated response if it has changed, or a short 'not modified' response if the client's copy
 * is still valid. Such responses increment both the network count and hit count.
 *
 * The best way to improve the cache hit rate is by configuring the web server to return cacheable

	}
	testValidHeader(&h, t)
}

// Issue 4393. It is valid to have an extra data header
// which contains no body.
func TestZeroLengthHeader(t *testing.T) {
	h := FileHeader{
		Name:   "extadata.txt",
		Method: Deflate,
		Extra: []byte{

        </field>
        <field>
          <name>checksumPolicy</name>
          <version>1.0.0+</version>
          <description>
            What to do when verification of an artifact checksum fails. Valid values are "fail" (default for Maven 4 and
            above), "warn" (default for Maven 3) or "ignore".
          </description>
          <type>String</type>
        </field>
      </fields>
    </class>

		jbytes, err := json.Marshal(healSequenceStatus{
			Summary: healFinishedStatus,
		})
		return jbytes, toAdminAPIErrCode(GlobalContext, err)
	}

	// Check if client-token is valid
	if clientToken != h.clientToken {
		return nil, ErrHealInvalidClientToken
	}

	// Take lock to access and update the heal-sequence
	h.mutex.Lock()
	defer h.mutex.Unlock()

      assertTrue(
          IntMath.biggestBinomials[k] == Integer.MAX_VALUE
              || !fitsInInt(BigIntegerMath.binomial(IntMath.biggestBinomials[k] + 1, k)));
      // In the first case, any int is valid; in the second, we want to test that the next-bigger
      // int overflows.
    }
    assertFalse(
        fitsInInt(
            BigIntegerMath.binomial(