Review __toString handling for path part

[AnrDaemon]

See

net-url/src/Net/Url.php

Lines 435 to 443 in 78602b1

	$path = explode('%2F', $parts['path']);
	$result .= implode('%2F', array_map(function($part){
	/*
	BUG?: paths containing, f.e., "@" are encoded.
	For future reference:
	https://tools.ietf.org/html/rfc3986#section-2.2
	*/
	return implode('/', array_map('rawurlencode', explode('/', $part)));
	}, $path));

Perhaps, use array_reduce to flatten the path directly into string.

Imported from AnrDaemon/library-php#3