Phar Class decompressFiles() bad in PHP 7.4 and 8.x branches

Description

The following code:

...

<?php
$p = new Phar('/home/gearond/my.phar', FilesystemIterator::SKIP_DOTS | FilesystemIterator::UNIX_PATHS, 'my.phar');
$p['myfile.txt'] = 'four score and seven years ago our fathers.';
$p['myfile2.txt'] = 'four score and severn years ago our mothers.';
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump($p->getSupportedCompression() );
var_dump( $p->compressFiles(Phar::GZ) );
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump( $p->decompressFiles() );
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump( $p->extractTo("/home/gearond/Project/exploration", null, true) );
?>

Resulted in this output:

string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
array(1) {
  [0]=>
  string(2) "GZ"
}
NULL
string(10) "myfile.txt"
bool(true)
bool(false)
bool(true)
string(11) "myfile2.txt"
bool(true)
bool(false)
bool(true)
bool(true)
string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
bool(true)

gearond@gearond-XPS-15-9570:~/Project/exploration$ cat *.txt
K�/-R(N�/JUH�KQ(N-K-�S�LM,*VHL�WI��d��K�/-R(N�/JUH�KQ(N-K�S�LM,*VHL�Wɦ%�d��gearond@gearond-XPS-15-9570:~/Project/exploration$ 

But I expected this output instead:

string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
array(1) {
  [0]=>
  string(2) "GZ"
}
NULL
string(10) "myfile.txt"
bool(true)
bool(false)
bool(true)
string(11) "myfile2.txt"
bool(true)
bool(false)
bool(true)
bool(true)
string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
bool(true)
gearond@gearond-XPS-15-9570:~/Project/exploration$ cat *.txt
cat *.txt
four score and severn years ago our mothers.four score and seven years ago our fathers.gearond@gearond-XPS-15-9570:~/Project/exploration$


### PHP Version

php 8.1.2 and 7.4

### Operating System

ubuntu 20.04 and 22.04

PHP 7.4 または 8.x で、提供されている Phar::compressFiles() と Phar::decompressFiles() の再現から始め、その後 Phar の実装とテストを追跡します。decompressFiles() が圧縮されたバイトではなく元のテキストを含む抽出ファイルを残せば完了です。