Add verification and conversion to a list of len-2 lists for mode-array

9 jobs for 183-unable-to-specify-a-single-mode in 6 minutes and 54 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #989933
documentation

00:01:33

passed #989928
example-ini-file-builds

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passed #989931
example-ini-file-pesummary

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passed #989929
injection-regression-test

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passed #989926
precommits-py3.6

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passed #989925
precommits-py3.7

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passed #989932
python-3.6

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passed #989927
python-3.7

00:01:12

71.0%
passed #989930
review-test-build

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