clarify the exp2 overload (#28) #941

Job	Run time
macos-13 / Release / homebrew-clang	20m 26s
macos-13 / Debug / homebrew-clang	27m 14s
ubuntu-22.04 / Release / gcc-11	26m 45s
macos-14 / Release / homebrew-clang	16m 53s
windows-2019 / Release / cl	38m 3s
ubuntu-22.04 / Debug / gcc-11	22m 33s
macos-14 / Debug / homebrew-clang	9m 25s
windows-2019 / Release / clang	33m 36s
ubuntu-22.04 / Release / gcc-12	30m 49s
windows-2019 / Release / clang-cl	35m 47s
ubuntu-22.04 / Debug / gcc-12	26m 32s
windows-2019 / Debug / cl	28m 38s
ubuntu-22.04 / Release / gcc-13	27m 37s
windows-2019 / Debug / clang	31m 36s
ubuntu-22.04 / Debug / gcc-13	23m 50s
windows-2019 / Debug / clang-cl	30m 23s
ubuntu-22.04 / Release / clang-14	26m 36s
windows-2022 / Release / cl	34m 14s
ubuntu-22.04 / Debug / clang-14	19m 54s
ubuntu-22.04 / Release / clang-15	26m 28s
windows-2022 / Release / clang	39m 53s
ubuntu-22.04 / Debug / clang-15	20m 29s
windows-2022 / Release / clang-cl	35m 47s
ubuntu-22.04 / Release / clang-16	27m 56s
windows-2022 / Debug / cl	35m 56s
ubuntu-22.04 / Debug / clang-16	20m 56s
ubuntu-22.04 / Release / clang-17	27m 51s
windows-2022 / Debug / clang	31m 3s
windows-2022 / Debug / clang-cl	34m 32s
ubuntu-22.04 / Debug / clang-17	22m 14s
	13h 53m 56s

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