public static function mkdir(string $path, $chmod=null) {
		// Figure out a good default CHMOD.
		if (! $chmod || ! \is_numeric($chmod)) {
			$chmod = (\fileperms(__DIR__) & 0777 | 0755);
		}

		// Sanitize the path.
		ref\file::path($path, false);
		if (! $path || (false !== \strpos($path, '://'))) {
			return false;
		}

		// We only need to proceed if the path doesn't exist.
		if (! @\is_dir($path)) {
			ref\file::untrailingslash($path);

			// Figure out where we need to begin.
			$base = \dirname($path);
			while ($base && ('.' !== $base) && ! @\is_dir($base)) {
				$base = \dirname($base);
			}

			// Make it.
			if (! @\mkdir($path, 0777, true)) {
				return false;
			}

			// Fix permissions.
			if ($path !== $base) {
				// If we fell deep enough that base became relative,
				// let's move it back.
				if (! $base || ('.' === $base)) {
					$base = __DIR__;
				}

				// Base should be inside path. If not, something weird
				// has happened.
				if (0 !== mb::strpos($path, $base)) {
					return true;
				}

				$path = mb::substr($path, mb::strlen($base), null);
				ref\file::unleadingslash($path);
				$parts = \explode('/', $path);
				$path = $base;

				// Loop through each subdirectory to set the appropriate
				// permissions.
				foreach ($parts as $v) {
					$path .= ('/' === \substr($path, -1)) ? $v : "/$v";
					if (! @\chmod($path, $chmod)) {
						return true;
					}
				}
			}
			else {
				@\chmod($path, $chmod);
			}
		}

		return true;
	}