Test

extras: Allow superscript to begin with plus, minus, or single quote #101

Job	Run time
test (1.21.x, ubuntu-latest, passthrough)	56s
test (1.21.x, ubuntu-latest, extras)	48s
test (1.21.x, macos-latest, passthrough)	30s
test (1.21.x, macos-latest, extras)	19s
test (1.21.x, windows-latest, passthrough)	1m 32s
test (1.21.x, windows-latest, extras)	54s
test (1.22.x, ubuntu-latest, passthrough)	44s
test (1.22.x, ubuntu-latest, extras)	45s
test (1.22.x, macos-latest, passthrough)	23s
test (1.22.x, macos-latest, extras)	20s
test (1.22.x, windows-latest, passthrough)	1m 48s
test (1.22.x, windows-latest, extras)	1m 51s
	10m 50s

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