Do not round floats in interpolate #1049

Job	Run time
build_benchmarks	43s
Fuzz targets (cargo-fuzz)	7m 23s
Fuzz targets (afl)	3m 42s
clippy	2m 8s
public_private_dependencies	50s
rustfmt	13s
cargo-deny	26s
test_avif	1m 59s
test_avif_decoding	2m 5s
test_big_endian	53s
test_features	1m 10s
test_toolchains (1.61.0)	1m 35s
test_features (default)	1m 11s
verify_msrv	3m 47s
test_toolchains (nightly)	1m 58s
test_big_endian (default)	2m 16s
test_features (gif)	54s
test_toolchains (beta)	1m 50s
test_features (jpeg)	1m 16s
test_big_endian (webp)	1m 30s
test_features (png)	40s
test_big_endian (webp-encoder)	2m 38s
test_features (tiff)	53s
test_features (ico)	1m 7s
test_features (pnm)	51s
test_features (tga)	1m 3s
test_features (webp)	1m 1s
test_features (bmp)	1m 6s
test_features (hdr)	1m 4s
test_features (dxt)	39s
test_features (dds)	37s
test_features (farbfeld)	35s
test_features (openexr)	52s
test_features (jpeg_rayon)	37s
test_features (webp-encoder)	55s
	52m 27s

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