Inverse FFT negates every input instead of twiddles, could be sped up?

[Shnatsel]

This code is negating the imaginary component of the input for reverse FFT on each reverse FFT operation instead of negating twiddles once in the planner:

PhastFT/src/algorithms/dit.rs

Lines 284 to 289 in 3fc78e0

	// Handle inverse FFT
	if let Direction::Reverse = planner.direction {
	for z_im in imags.iter_mut() {
	*z_im = -*z_im;
	}
	}

The doc comment on direction mentions adjusting the twiddles, but that's not how it currently works:

PhastFT/src/planner.rs

Lines 12 to 13 in 3fc78e0

	/// Multiply the exponent term in the twiddle factor by -1
	Reverse = -1,