try to fix duplicate stub for "ob_implicit_flush()"

-> INFO: "I think it's better to use `#[LanguageLevelTypeAware]` to set different parameter types and remove default value completely. As far as parameter has `[optional]` in phpdoc there will be no warning in PhpStorm that parameter is missed. If you still want to add some default value you can set 1 or true, in any case on the call of `ob_implicit_flush()` default value from extension will be used in runtime and default value from stubs actually will not be used." - @isfedorov

standard/standard_8.php

@@ -369,27 +369,16 @@ function ob_get_status (bool $full_status): array
 function ob_get_contents (): string|false
 {}
 
-#[PhpStormStubsElementAvailable(to: '7.4')]
 /**
  * Turn implicit flush on/off
  * @link https://php.net/manual/en/function.ob-implicit-flush.php
- * @param int $enable [optional] <p>
- * 1 to turn implicit flushing on, 0 turns it off.
+ * @param int|bool $enable [optional] <p>
+ * 1|<b>TRUE</b> to turn implicit flushing on, 0|<b>FALSE</b> turns it off.
+ * <br><br>default: 1|<b>TRUE</b>
  * </p>
  * @return void
  */
-function ob_implicit_flush (int $enable = 1): void {}
-
-#[PhpStormStubsElementAvailable('8.0')]
-/**
- * Turn implicit flush on/off
- * @link https://php.net/manual/en/function.ob-implicit-flush.php
- * @param bool $enable [optional] <p>
- * true to turn implicit flushing on, false otherwise.
- * </p>
- * @return void
- */
-function ob_implicit_flush (bool $enable = true): void {}
+function ob_implicit_flush (#[LanguageLevelTypeAware(["8.0" => "bool"], default: "int")] $enable): void {}
 
 /**
  * List all output handlers in use