I am so sorry I haven't replied before. Thank you for testing the first release of LiteXL.

Actually that is a problem I have on one of my systems, and tried to fix it, but it seems it has to do with the system locale.
On the same system I tested the lua binary and lua 5.3 seems to not have that issue (always treats dot as a float), but lua 5.2 does. Unfortunately that LiteXL version requires lua 5.2. Also, the lua 5.3 compiled with 5.2 compatibility has the same issue as well.

I will investigate more on a fix for the next release. Thank you for reporting this.

Hope LiteXL is useful for you guys. It is the first release, and issues are going to be ironed out.