Description:
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When a Number with more than 3 characters is formatted with the NumberFormatter, a non-breaking Space is added after the white space in locale Poland.

This isn't always visible, but can be seen with a hex Editor:
Expected Result:
1090663 -> '1 090 663' -> 1 090 663
PHP Result:
1090633 -> '1 090 663' -> 1 090 663

Working example can be seen here: https://3v4l.org/B6lck


Test script:
---------------
<?php

$formatter = NumberFormatter::create('PL', NumberFormatter::DECIMAL);

$result = $formatter->format(1090663, NumberFormatter::TYPE_DOUBLE);
echo $result . ' = ' . bin2hex($result) . PHP_EOL;
echo '1 090 663' . ' = ' . bin2hex('1 090 663') . PHP_EOL;

Expected result:
----------------
1 090 663 = 312030393020363633
1 090 663 = 312030393020363633

Actual result:
--------------
1 090 663 = 31c2a0303930c2a0363633
1 090 663 = 312030393020363633