Initializes finfo object lazily

File.php

		string $contents = ''
		) {
		- self::$finfo ??= new finfo( FILEINFO_MIME_TYPE );
		-
		$this->name = $name;
		$this->sha = $sha;

		default => self::ICON_FILE,
		});
		+ }
		+
		+ private static function fileinfo(): finfo {
		+ return self::$finfo ??= new finfo( FILEINFO_MIME_TYPE );
		}

		private function detectMediaType( string $buffer ): string {
		return $buffer === ''
		? self::MEDIA_EMPTY
		- : (self::$finfo->buffer( substr( $buffer, 0, 256 ) )
		+ : (self::fileinfo()->buffer( substr( $buffer, 0, 128 ) )
		?: self::MEDIA_OCTET);
		}

Delta	5 lines added, 3 lines removed, 2-line increase