Allows passing tag for lookup

git/Git.php

		$data = $this->read( $commitOrTreeSha );

		+ if( preg_match( '/^object ([0-9a-f]{40})/m', $data, $matches ) ) {
		+ return $this->getTreeSha( $matches[1] );
		+ }
		+
		if( preg_match( '/^tree ([0-9a-f]{40})/m', $data, $matches ) ) {
		return $matches[1];


		while( $position < $length ) {
		- // Inline parsing for speed
		$spacePos = strpos( $data, ' ', $position );
		$nullPos = strpos( $data, "\0", $spacePos );

		];
		}
		-
		- // --- Tree Processing ---

		private function walkTree( string $sha, callable $callback ): void {

Delta	4 lines added, 3 lines removed, 1-line increase