ComfyUI's pixel coords are int64 -- latent corners multiplied by integer VAE scale factors --
while centring a reference on the target's height and taking a clip midpoint are half-pixel
operations. Adding a float shift into a Long tensor in place raises "result type Float can't
be cast to the desired output type Long", which is where the sidecar layout landed next.
_apply_tass_layout now promotes both coordinate tensors to float32 for the shift and rounds
back to the caller's dtype on the way out. Rounding matters: the caller casts the reference
coords to the target grid's dtype when concatenating, and a cast truncates where rounding is
what a half-pixel centre wants.
The earlier tests missed this because they built float tensors -- test_tass_layout now runs
every layout on int64 input and checks both the dtype and that the result stays within half
a pixel of the float placement.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HGYHCVjHe6acihEpCRyn1K
