Function validate_range_decimal 

pub fn validate_range_decimal(
    field: &'static str,
    value: &Decimal,
    min: Option<i64>,
    max: Option<i64>,
) -> Result<(), CoolError>

Decimal-typed @range enforcement. The parser accepts integer bounds (@range(min: 0, max: 100)) on both Int and Decimal fields; the i64 bounds are promoted to Decimal here so monetary fields can declare the same shape as integer counters. Banks routinely write things like amount Decimal @range(min: 0) to forbid negative amounts at the framework layer — without this, the validator silently no-ops and out-of-range values reach the database.