I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
If someone said, "a guy came into my shop today", most people in the UK would imagine the visitor to be a man. Just like most people would imagine the visitor to be an adult, even though, "guys" could encompass any ages.
Yes, I know women who use "guys" when referring to groups of exclusively women, but it's not the common use you're trying to claim, and there are alternatives which are more inclusive.
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If someone said, "a guy came into my shop today", most people in the UK would imagine the visitor to be a man. Just like most people would imagine the visitor to be an adult, even though, "guys" could encompass any ages.
Yes, I know women who use "guys" when referring to groups of exclusively women, but it's not the common use you're trying to claim, and there are alternatives which are more inclusive.