u8_totitle() fails to handle "." as a word separator

[Bernard Moreton]

u8_totitle() fails to handle "." as a word separator, though the dot is commonly used without any space-character where initials precede a surname.
for example, the street address "Largo A.Gemelli"is rendered "Largo A.gemelli"

I find it necessary to include the dot (.), comma (,), opening and closing parentheses [(,)], hyphen (-), single and double quotes (',"), and the forward slash (/) as word separators; but the dot (.) is the most common, after the correctly-handled space ( ).

I have libunistring 0.9.10-2
under Ubuntu 20.04 LTS

 lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

apt-cache policy libunistring2
libunistring2:
  Installed: 0.9.10-2
  Candidate: 0.9.10-2
  Version table:
 *** 0.9.10-2 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

[Bernard Moreton (bernard-moreton-1)]

u8_totitle accepts most of the non-alphanumeric ascii codes as word-separators, but besides the 'dot', it fails to recognize the colon (:) and the underscore (_) as separators (can't see why), and also fails the recognize the apostrophe.

I can see reason for this last - one wouldn't want "Adam'S House", or (for that matter) "Wouldn'T".
But I suspect that there would be more cases of "M de l'Isle", or "Charles o'Hara", where the names do require capitalisation.
The abbreviative use would normally be followed by a single character (and that normally "s"), so could be allowed for with a test on the length of the following "word".