Yes you are right, I fell back into my misunderstanding that operators like / are overloaded, while you are making "between" a constant which returns objects blessed with a class with overloaded operators.

Since / is only overloaded for that class it doesn't interfere with other parsing "objects".

I doubt it's even possible in Perl to overload operators for unblessed objects like literals or scalar variables.

(unless using the autobox module which hooks into the compiler via XS.)