An escape sequence instead of the tag's bracket

[salmonsenya]

Hello! I have encountered the following problem: I expect text
It is part of the <а href="https://example.com/upload/images/31271_offer.pdf"> user agreement</а>

to look exactly the same after sanitization (a, href are allowed). Instead it contains escape sequences:

It is part of the <а href="https://example.com/upload/images/31271_offer.pdf"> user agreement

How may I avoid this behavior?

[mganss]

The a in your example is not a latin a (0x61) but a cyrillic a (0x430).

[salmonsenya]

Omg, so stupid of me! Thank you so much