Elliptic surfaces fixes (#4177) #16868

Job	Run time
test (1.6, short, ubuntu-latest)	1h 30m 6s
test (1.6, long, ubuntu-latest)	54m 4s
doctest (1.10, ubuntu-latest)	25m 50s
test (1.10, short, ubuntu-latest)	1h 12m 23s
doctest (1.11-nightly, ubuntu-latest)	25m 2s
test (1.10, long, ubuntu-latest)	43m 59s
doctest (nightly, ubuntu-latest)	25m 41s
test (1.11-nightly, short, ubuntu-latest)	1h 26m 21s
doctest (1.10, ubuntu-latest, depwarn=error)	25m 23s
test (1.11-nightly, long, ubuntu-latest)	51m 39s
doctest (1.10, macOS, RPTU)	12m 30s
test (nightly, short, ubuntu-latest)	1h 25m 24s
test (nightly, long, ubuntu-latest)	49m 47s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 11m 48s
test (1.10, long, ubuntu-latest, depwarn=error)	42m 52s
test (1.10, short, macOS, RPTU)	14m 12s
test (1.10, long, macOS, RPTU)	14m 1s
test (1.10, book, ubuntu-latest)	51m 53s
test (nightly, book, ubuntu-latest)	59m 24s
	15h 2m 19s

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