Elliptic surfaces fixes #16835

Job	Run time
doctest (1.10, ubuntu-latest)	25m 55s
test (1.6, short, ubuntu-latest)	1h 35m 19s
doctest (1.11-nightly, ubuntu-latest)	26m 32s
test (1.6, long, ubuntu-latest)	58m 18s
doctest (nightly, ubuntu-latest)	25m 34s
test (1.10, short, ubuntu-latest)	1h 12m 23s
doctest (1.10, ubuntu-latest, depwarn=error)	26m 53s
test (1.10, long, ubuntu-latest)	46m 5s
doctest (1.10, macOS, RPTU)	12m 29s
test (1.11-nightly, short, ubuntu-latest)	1h 24m 34s
test (1.11-nightly, long, ubuntu-latest)	53m 12s
test (nightly, short, ubuntu-latest)	1h 26m 53s
test (nightly, long, ubuntu-latest)	51m 32s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 8m 25s
test (1.10, long, ubuntu-latest, depwarn=error)	48m 43s
test (1.10, short, macOS, RPTU)	13m 56s
test (1.10, long, macOS, RPTU)	14m 25s
test (1.10, book, ubuntu-latest)	53m 18s
test (nightly, book, ubuntu-latest)	1h 6m 6s
	15h 30m 32s

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