utils: fix dec wrap #533

Job	Run time
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.20)	11m 5s
On ubuntu-20.04 with (gcc-7, python-3.12, numpy-2.0.1)	11m 30s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.20)	11m 7s
On ubuntu-20.04 with (gcc-9, python-3.12, numpy-2.0.1)	10m 40s
On macos-latest with (clang, python-3.9, numpy-1.20)	23m 41s
On macos-latest with (clang, python-3.12, numpy-2.0.1)	20m 1s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	56s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	53s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	50s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	56s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	55s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	54s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 17s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	58s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	50s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 22s
	1h 55m 55s

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