Do not round floats in interpolate #1051

Job	Run time
test_big_endian	1m 33s
test_features	52s
test_big_endian (default)	2m 18s
test_features (default)	1m 58s
build_benchmarks	1m 21s
test_big_endian (webp)	1m 40s
test_features (gif)	29s
Fuzz targets (afl)	1m 22s
test_big_endian (webp-encoder)	2m 13s
test_features (jpeg)	36s
Fuzz targets (cargo-fuzz)	6m 59s
test_features (png)	33s
clippy	2m 9s
test_features (tiff)	58s
cargo-deny	24s
test_features (ico)	1m 6s
public_private_dependencies	24s
test_features (pnm)	38s
rustfmt	5s
test_avif	1m 38s
test_features (tga)	1m 14s
test_avif_decoding	1m 16s
test_features (webp)	49s
test_features (bmp)	31s
test_toolchains (1.61.0)	1m 37s
verify_msrv	3m 39s
test_features (hdr)	50s
test_toolchains (nightly)	1m 15s
test_features (dxt)	32s
test_toolchains (beta)	1m 59s
test_features (dds)	49s
test_features (farbfeld)	52s
test_features (openexr)	40s
test_features (jpeg_rayon)	1m 17s
test_features (webp-encoder)	1m 0s
	47m 36s

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