double_t -> double #168

Job	Run time
clang_14_build	49m 9s
gcc_build11b	1h 24m 55s
gcc_build	13m 54s
gcc_build12	16m 56s
github_20 (g++-12, Debug)	28m 49s
ci_test_compilers_clang2 (15-bullseye)	13m 39s
gcc_build_no_deprecated	13m 31s
ci_test_compilers_clang2 (13)	13m 30s
ci_test_compilers_gcc2 (12)	20m 27s
github_20 (g++-12, Release)	29m 26s
ci_test_compilers_gcc2 (latest)	18m 31s
ci_test_compilers_clang (12)	24m 0s
ci_test_compilers_clang (14)	22m 28s
ci_test_compilers_gcc (latest)	15m 38s
ci_test_compilers_gcc (9)	13m 44s
ci_test_compilers_gcc (12)	15m 53s
ci_test_compilers_clang (13)	21m 59s
ci_test_compilers_clang (15-bullseye)	20m 54s
ci_test_compilers_clang (11)	24m 23s
ci_test_compilers_gcc (10)	15m 28s
ci_test_compilers_gcc (11)	16m 11s
ci_test_compilers_gcc (8)	13m 39s
	8h 27m 4s

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