Zend\I18n\Translator\TextDomain storage - whitespace in key

[ma-si]

Translation with text_domain not working for gettext.

In second example key is ui�name with whitespace.

Case working:

PoEdit Source keywords:
translate:1
translatePlural:1,2

$this->translatePlural('name', 'names', 1, 'ui')
TextDomain storage gives:
["storage":"ArrayObject":private]=> array(2) { ["name"]=> array(3) { [0]=> string(5) "imiÄ™" [1]=> string(6) "imiona" [2]=> string(5) "imion" } ["names"]=> string(0) "" }

Case not working:

PoEdit Source keywords:
translate:1**,2c**
translatePlural:1,2**,4c**

This is configuration to update only defined text_domain from source code.
PoEdit works well

$this->translatePlural('name', 'names', 1, 'ui')
TextDomain storage gives:
["storage":"ArrayObject":private]=> array(2) { ["ui�name"]=> array(3) { [0]=> string(5) "imiÄ™" [1]=> string(6) "imiona" [2]=> string(5) "imion" } ["names"]=> string(0) "" }

In .po file there is one difference:
msgctxt "ui"
msgid "name"
msgid_plural "names"
msgstr[0] "imię"
msgstr[1] "imiona"
msgstr[2] "imion"

[ma-si]

\x04 EOT in storage array key

["storage":"ArrayObject":private]=> array(2) { ["ui\x04name"]=> array(3) { [0]=> string(5) "imię" [1]=> string(6) "imiona" [2]=> string(5) "imion" } ["names"]=> string(0) "" }