[wp-hackers] Use a period in permalinks

[WP Customizer]

I am trying to use a . (period) in a permalink for a page, but it just
changes to a - (dash).  Is there anyway to get this to work with a period, I
want to include a non-whole number as part of the permalink like
mysite.com/hello-world-1.0.1 or mysite.com/1.1