I ran into this with C#/.NET on Windows - I tried to convert a string "1.3" to the float 1.3, and it failed on languages that use comma as their decimal separator.
Indeed. As a person from a comma country, I find these mistakes in most code bases I look at. It makes it frustrating to contribute to open source, for example.
Perhaps it’ll make you feel better about your parsing bug that even the C# compiler (Roslyn) code base had several of these issues.
That was a learning experience.