catch a corner case for elliptic surfaces (#3880) #147

Job	Run time
doctest (1.10, ubuntu-latest)	28m 31s
doctest (1.11-nightly, ubuntu-latest)	29m 54s
doctest (nightly, ubuntu-latest)	28m 29s
doctest (1.10, ubuntu-latest, depwarn=error)	28m 23s
doctest (1.10, macOS, RPTU)	1s
test (1.6, short, ubuntu-latest)	1h 10m 23s
test (1.6, long, ubuntu-latest)	40m 36s
test (1.10, short, ubuntu-latest)	53m 4s
test (1.10, long, ubuntu-latest)	34m 4s
test (1.11-nightly, short, ubuntu-latest)	58m 56s
test (1.11-nightly, long, ubuntu-latest)	33m 23s
test (nightly, short, ubuntu-latest)	1h 3m 0s
test (nightly, long, ubuntu-latest)	39m 54s
test (1.10, short, ubuntu-latest, depwarn=error)	50m 11s
test (1.10, long, ubuntu-latest, depwarn=error)	32m 36s
test (1.10, short, macOS, RPTU)	1s
test (1.10, long, macOS, RPTU)	1s
test (1.10, book, ubuntu-latest)	32m 42s
	10h 24m 9s

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