Do not round floats in interpolate #1050

Job	Run time
Fuzz targets (cargo-fuzz)	4m 9s
build_benchmarks	1m 30s
Fuzz targets (afl)	1m 23s
cargo-deny	51s
clippy	4m 43s
public_private_dependencies	30s
rustfmt	15s
test_avif	1m 13s
test_avif_decoding	2m 5s
test_big_endian	53s
test_features	33s
test_big_endian (default)	3m 26s
verify_msrv	6m 3s
test_toolchains (1.61.0)	1m 7s
test_features (default)	2m 8s
test_big_endian (webp)	1m 10s
test_toolchains (nightly)	2m 3s
test_features (gif)	43s
test_big_endian (webp-encoder)	2m 0s
test_toolchains (beta)	1m 15s
test_features (jpeg)	1m 15s
test_features (png)	41s
test_features (tiff)	38s
test_features (ico)	44s
test_features (pnm)	32s
test_features (tga)	26s
test_features (webp)	35s
test_features (bmp)	34s
test_features (hdr)	50s
test_features (dxt)	48s
test_features (dds)	48s
test_features (farbfeld)	37s
test_features (openexr)	1m 25s
test_features (jpeg_rayon)	44s
test_features (webp-encoder)	51s
	49m 28s

Provide feedback