@denixport 's feedback in #4493 :
> Yes, there was an issue with locales that use non-breaking space for formatting. 
> Basically for the same NumberFormatter ->parse() didn't get initial number from 
> string produced by ->format() that's what [this line] tries to address. 
> I don't see this issue with recent ICU, so I think with proper tests this line should be removed

Might be safer to keep this line in case any users are stuck with an older ICU lib that has this issue? Asking since I don't know how ICU is bundled/used-by the Intl extension.