Improve Span API #1217

Job	Run time
Tests (ubuntu-latest, 7.2, lowest)	23s
Tests (ubuntu-latest, 7.2, highest)	50s
Tests (ubuntu-latest, 7.3, lowest)	1m 23s
Tests (ubuntu-latest, 7.3, highest)	57s
Tests (ubuntu-latest, 7.4, lowest)	25s
Tests (ubuntu-latest, 7.4, highest)	56s
Tests (ubuntu-latest, 8.0, lowest)	20s
Tests (ubuntu-latest, 8.0, highest)	58s
Tests (ubuntu-latest, 8.1, lowest)	16s
Tests (ubuntu-latest, 8.1, highest)	51s
Tests (ubuntu-latest, 8.2, lowest)	15s
Tests (ubuntu-latest, 8.2, highest)	56s
Tests (ubuntu-latest, 8.3, lowest)	18s
Tests (ubuntu-latest, 8.3, highest)	56s
Tests (windows-latest, 7.2, lowest)	58s
Tests (windows-latest, 7.2, highest)	52s
Tests (windows-latest, 7.3, lowest)	58s
Tests (windows-latest, 7.3, highest)	1m 34s
Tests (windows-latest, 7.4, lowest)	56s
Tests (windows-latest, 7.4, highest)	1m 36s
Tests (windows-latest, 8.0, lowest)	43s
Tests (windows-latest, 8.0, highest)	1m 34s
Tests (windows-latest, 8.1, lowest)	44s
Tests (windows-latest, 8.1, highest)	1m 25s
Tests (windows-latest, 8.2, lowest)	47s
Tests (windows-latest, 8.2, highest)	1m 39s
Tests (windows-latest, 8.3, lowest)	53s
Tests (windows-latest, 8.3, highest)	1m 32s
	25m 55s

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