Function float_dense_body_std 

pub fn float_dense_body_std<T: Float>(
    op: ArithmeticOperator,
    lhs: &[T],
    rhs: &[T],
    out: &mut [T],
)

Scalar floating-point arithmetic kernel for dense arrays (no nulls). Division by zero produces Inf/NaN rather than panicking. Power operations use logarithmic exponentiation: exp(b * ln(a)).