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.)
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