Hurmet author here. Your points are excellent. I'll fix the exponent parsing error and create an inline `mod` operator. I should have a fix up later today.
In Hurmet, the `%` character is a percentage operator, not a modulo operator. That's because Hurmet’s main target users are not programmers, but engineers in the physical sciences, that is, civil engineers, mechanical engineers, electrical (power) engineers, etc. Most of them would not recognize `%` as a modulo.